Argyll CMS change log
=====================
Version 0.70 changes - open version (beta)
--------------------
[Beta 8 Snapshot 2008/1/15]
* Added -S and -L options to spectro/dispwin for Unix/X11
systems, to allow setting and using the _ICC_PROFILE
root window property to store the displays profile
and calibration.
* Changed MSWindows and OS X dispwin/dispcal/dispread test
window to be title and borderless, and also have
an option (-B) to mask the whole screen behind the
test window with black.
* Added a "create intersection gamut" method
to the gamut class, and also added a companion
-i/-I flag to viewgam to print out the intersecting
volume of the first two gamuts, and oprionaly
save the intersecting gamut. Improved robustness of
the gamut "radial" point test methods slightly.
* Fixed spotread so that it doesn't display any
color information when reading the Huey ambient
sensor, and added an option (-T) to show
color temperature for each reading.
* Added gamut volume report (with -v) to tiffgamut.
* Changed spectro/spyd2setup.h to only set the
loaded flag after sucessfuly loaded a firmware file.
* Changed numlib/numsup.c error, warning and verbose
functions into function pointers so that they
can be overridden by callers of library functions
that make use of them (lprof).
* Switched icc and cgats library from
the "BSD like" license to the "MIT" license.
* Added better DTP22 support to driver and
printtarg.c (thanks to Nigel Rowe)
* Fixed spectro/ntio.c to cope gracefully with systems
that don't have any serial ports.
* Renamed spectro/printread to spectro/chartread.
* Fixed problem in spectro/usbio.c where on
some systems usb_detach_kernel_driver_np() needs
to be called before usb_set_configuration().
* Added option to dispread to allow a shell callout
with each color being tested, to allow relaying the
test patch value to a remote display via a script.
* Removed spectro/filmread.c and target/filmtarg.c
until their licensing compatibility with GPLv3 is
figured out.
* Added -W parameter to instrument using programs,
that allows overriding the default serial flow
control protocol. This may allow working around
problems caused by flow control not working
on certain systems.
* Added quick ICC profile creation to dispcal,
so that single operation calibration & profile
is now possible.
* Fixed some bugs in cctiff handling of Lab PCS and/or
-p operation.
* Added a new test chart type to render/timage, for
testing profile B2A tables.
* Added -V option to spectro/dispwin, that verifies
the currently loaded calibration.
* Added (yet another!) variation of the spectral
field names to support colorport output,
to profile/logo2cgats.
* Fixed problem with dispcal -u (and possibly
other cases, ie. profile) where an out of range
VideoLUT calibration value can wrap around
rather than saturating.
* Improved black point setting in dispcal,
so that it doesn't get lighter if the white point
is reset during the run. Also changed the white
point cliping to use the device model, rather than
relying in the cube clipping code, which was not
so accurate.
* Modified profout per channel curve algorithm
to be encapsulated in an independent module (xicc/xfit.c),
and to create input curves that adjust the curve shape and
clut grid locations independently of each other.
This has similar performance to the old code in many
cases, but reduces fit errors for certain types
of device characteristics.
[Beta 7 Snapshot 2007/10/15]
* Fixed minor bug in icc.c - was double freeing while
a V4 profile was being rejected.
Also changed SYMETRICAL_DEFAULT_LAB_RANGE
B2A input curve tweak for 16 bit -
the range can be almost -128 to 128 and still
remain symetrical.
* Improved robustness of dispcal in zeroing in
on the neutral patches. Got Jacobian matrix
refinement going, added device value clipping,
and made it revert back to the best ever
value as a worst case result. Tested all the colorimeters
on every platform, fixed bugs with spyder on
different platforms (USB bugs ?).
* Tweaked spyder driver to improve repeatability
for low light conditions - made integration
time adaptive.
* Added Huey colorimeter support, including driving
it through the HID drivers on MSWindows and OS X.
* Added Spyder 2 Colorimeter support, including the
firware transfer utility spyd2en, to allow the
end user to get their instrument workings.
* Fixed a problem in dispwin/dispcal/dispread not keeping
the Gnome screensaver at bay.
* Fixed very minor error in profile that caused a crash
if -taw was used without a -s.
* Hopefully fixed the last lingering issues with the
gamut function "split plane" problem. Improved
the split plane choice criteria too, reducing
the structure size and (presumably)
improving interogation speed slightly.
(Visualizing things always helps a lot!)
[Beta 6 Snapshot 2007/9/15]
* Fixed bugs in dispcal target curve - the curves
didn't seem to be as neutral as they should be.
* Changed HCFR setup to assume no special 2mm apatures
on its sensors, since this is the default hardware configuration.
* Added support for more scan targets. The list is now:
IT8.7/2, ColorCheckerDC, ColorCheckerSG,
Eye-One Pro Scan Target 1.4 and HutchColor HCT.
* Fixed bug in printread -xl :- XYZ wasn't being scaled to 100
(thanks to Duane Ruck for pointing this out).
* Fixed bug that affected printread handling a chart with
the patch location identifier that has patch location
before strip location. This was affecting reading the
Eye-One Pro Scan Target 1.4 chart.
* Added a -a flag to printread, to cause the patch locations
to be saved to the output, so that a chart read can be used
to create a scan/input CIE reference file.
* Added good/bad beeps to printread for the Eye-One Pro,
to speed up chart reading.
* Added a -B flag to print read, to disable bi-directional
strip recognition if the reference patch values are not to
be relied upon.
* Modified i1pro patch recognition to make it more
sensitive to differences in just some wavelength bands
- this fixes Eye-One Scan Target 1.4 patch recognition,
and generally helps robustness for all charts.
* Supressed "There is at least one patch with an very unexpected response!"
warning in printread unless the expected values were created using
a specific device model such as an ICC or MPP profile in targen.
[Beta5a Snapshot 2007/9/10]
* Fixed bug that had crept into profile/profout.c
that wreckes the contents of the gamut lut.
* Added a manual chart recognition fiducial marks to
print charts that are intended to be scanned in (printtar -s),
so that manual chart recognition can be used on these too.
[Beta5 Snapshot 2007/8/28]
* Fixed serious bug in dispcal & dispread on Linux -
screensaver suppression using fork() was causing
programs to execute twice at the same time.
* Changed spectro/dispcal.c calibration algorithm
to be faster, more precise, and more robust.
Improved handling of "native white" mode
to better hit the target 1.0 RGB values.
This should contain the worst case errors better.
* Changed printtarg to pad i1 test chart last row,
since the printread logic can't cope otherwise.
* Added a manual chart recognition option (-F) to scanin,
that makes use of fiducial marks defined in the .cht file.
* Added a -G gamma option to scanin/scanin to allow
some flexibility in the face of extreme device behaviour.
* (Hopefully) fixed DTP02Q thanks to feedback from Udo Lembke.
* Changed all of my code and other GPL code that allows upgrading,
to the GPL Version 3 license. Corrected "licence" to "license"
in many (but probably not all) places.
* Modified DTP51 driver to ignore a "bad command"
error to the GI command (allow for old firmware ?)
* Modifed dtp20 on-line reading to be more forgiving
of unexpected status after a strip read.
* Added some fudge scale factors for i1pro emission
and ambient modes. I'm not sure at the moment where the
real scale factors come from, so I've roughly matched
the scale to what the GM driver returns.
Also add fudge factor for i1display2 ambient mode.
* Fixed some bugs that had crept into DTP20
offline chart reading (not reading, heap corruption on free).
* Added diagnostic for DTP20 offline chart reading
to hint at what strip hasn't been read.
* Changed printtarg to optimise contrast between
test patches and spacers.
* Added "aproximate least squares" setting mode
to icc set_lut and rspl set_rspl to improve average
accuract when setting interpolation arrays from
a function (ie. when inverting A2B).
* Added a "display with normalized brightness" to spot
read to make it easier to verify spot readings
for a display profile.
* Fixed "r" and "rl" intents so that the white points
are linearly mapped, as is the normal expectation with
relative colorimetric intents.
[Beta4 Snapshot 2007/5/16]
* Fixed icclib to handle unknown tag types now,
as well as cope more gracefully with ProfileMaker4
profiles that have an illegal flag value in their
data tagtype flag field.
* Modified gamut mapping to improve coherence of mapping
outside the source gamut when used to create B2A table.
* Created first cut of VRML debug plot library in plot/vrml.c,
and switched gamut/gammap.c to use it. Other diagnostics
could be switched to use it too (ie gamut/gamut.c).
* Modified ciecam02 to improve handling of imaginary colors,
and coherence in those regions.
* Added a delay between setting a screen color (spectro/dispwin.c)
and starting to read the patch with a display instrument.
* Fixed issue on OS X with locating displays - IO dictionary
string handling.
* Made the dispcal/dispread calibration a bit friendlier if the
instrument doesn't actually support calibration.
* Added profile comment options to link/icclink.
* Fixed bugs in xicc/xicc.c and xicc/xlut.c that were affecting
how black generation was controlled by the input luminence
value for a -kp option. This affected profile/profile the
most, but could also have changed how link/icclink -G
generates black as well. The black generation should now
match quite closelgy between the B2A tables generated
by profile/profile, and the black generation generated
by link/icclink -G.
* Added "patch by patch" mode to print read, that allows
reading media where strip recognition is unreliable.
* Added patch consistency tolerance modifier to
printread and the i1pro driver.
[Beta3 Snapshot 2007/4/10]
* Modified i1pro driver to do scan measurements with
single USB read, to avoid read latency issues.
* Added display/emission distinction for i1pro,
to speed up display measurement, while still allowing general
ambient measurements to be adaptive. Added display mode
to spotread.
* Added workaround to the i1pro rev D crashing on
close under Linux. It's reset rather than closed.
* Modified libusb-win32 to fix problem with i1pro rev D
crashing on a get_configuration.
* Reworked scan patch recognition to work for reflective
or emissive scans, and to be more tolerant of noisy media.
* Added support for emission scans to i1pro and printreaf.
* Fixed ref/*.sp files, as well as adding back in D50*.sp
variations that seem to have gone missing.
* Change i1pro trigger/read logic to ensure that
process scheduling latency doesn't cause the read to
be late, causing read failure. Add trigger/read timing diagnostics.
* Fix i1pro switch thread cleanup to avoid memory access fault.
* Tweak xicc/xspect.c FWA to have better estimation accuracy
with a range of paper stocks, as verified by xicc/spectest2.c
and xicc/spectest.c
* Fixed spotread to display FWA corrected spectra correctly,
as well as fix some bugs with the reference spectra.
[Beta2 Snapshot 2007/3/29]
* Fixed gcc 3.3 optimiser problems on OS X which were
causing crashes in spotread -S and i1pro high res.
* Modified spec2cie to look for specific device values to
identify white, since some devices fool looking for maximum Y.
* Fix triggering to make FWA spotreads work.
* Fix bug in Spectrolino calibration with filter messages
work properly.
* Fix bugs with DTP41 and DTP51 triggering.
* Change how rows per strip are stored in .ti2 file,
to remove base 62 limit.
* Increase scope of target/printtarg scale options,
and add extra scale for spacers.
* Changed Linux serial port location to look
for /dev/ttyUSB* as well as /dev/ttyS*,
and only offer them if they can be opened.
* Fix i1pro driver so that it does not return
spectral data unless asked.
[Beta1 Snapshot 2007/3/22]
* Finished i1pro driver by adding highres spectral mode
(+ matching changes in dispcal, dispread, printread, spotread),
and making the calibrations non-volatile so that
they can be retained between utility starts.
* Changed the default observer backto the 1931 2 degree
observer in various programs (profile etc.), so there
is less surprise at the discrepancy between the
default instrument values and the values when
spectral data is used.
* Changed profile/logo2cgats so that it uses a heuristic to
determine if the spectral data needs scaling by 1.0 or
100.0, since it seems the type of file cannot be relied upon
as an indicator.
* Fixed link/icclink to record a more accurate summary of
overall intent in the header.
* Re-worked tweak/refine.c slightly, to try and improve how
it copes with out of gamut points. Added automatic
extra weight (5) for lightest patch.
* Added new black generation feature to link/icclink. It can
now take the output inking from that of the output profile
B2A table, just like revfix.
* Fix bug in link/icclink - the changeover to using K target rather than
locus had a bug in it. It was still partially defaulting to locus rather
than K value target (some C library has a global called locus ?)
* Made it so Eye-One pro can recognise strips when read in either direction.
* Re-worked instrument calibration and measurement triggering
to support instrument operated buttons.
* Added support for DTP20 spectrometer.
* Added support for Eye-One Pro spectrometer.
* Fixed bug in profile where RGB space profiles didn't handle FWA correctly.
* Fixed some bugs in cctiff that were causing inacurate results.
* Added support for the DTP22/Digital Swatchbook.
* Changed serial port driven instruments type to be automatically
recognized, eliminating the need for the -i option on
all the instrument using utilities (dispcal, dispread, printread, spotread).
* Reworked gamut hull triangulation, hopefully making it more
robust against any numerical issues.
* Fix bug in printtarg that caused green spacers instead of white ones.
* Added -c flag to spectro/dispwin. This clears a display
calibration.
* Added support for Eye-One Display 1 and 2 colorimeters.
* Added extra configuration for DTP92 to cope with
a firmware bug for certain early DTP92Q instruments.
* Fixed bug in logo2cgats - X-Rite ColorPort spectral data
is already scaled to 100, so only do this for Gretag files.
* Added the -m flag to scanin/scanin, to allow it to
return true mean values, rather than robust mean values
(but see latter bugfix).
* Fixed a bug in profile/profout.c that caused some matrix shaper
profile to generate colorant XYZ values slightly less than
0.0, due to numerical inacuracy, triggering an assert.
* Added a new option to spectro/spot read to allow use of
the Spectrolino with filters fitted.
* Added error handler to spectro/dispwin.c, so that there
is not a fatal error triggered in just listing the
screens on an X11 system running TwinView or MergedFB.
* Fixed problem with USB/DTP94 that caused instrument
coms to fail after doing calibration.
* Fix bug in render/timage.c that caused central wedge to be
corrupted.
Version 0.60 changes (July 17 2006)
--------------------
* Changed both gamut mapping intents, and enumerated
viewing conditions to be symbolic mnemonics, so that
the options don't change as intents and viewing conditions
are added, deleted or re-ordered. Selection of
intents or viewinging conditions using a numerical
enumerator is no longer supported, to help
catch problems caused by changes to the list
with this releas.
* Fixed bug in profile/profile.c when creation XYZ PCS
LUT profiles - the gamut tag was being created with the
wrong color space, and often this would cause an
internal fault in gamut surface creation.
* Changed profile/profile so that if a source
gamut/profile is supplied for display LUT type
profile creation, an ICC V2.4.0 profile is created
with all 3 intent tables, rather than the single
colorimetric intent that is default for ICC V2.2.0 and
earlier. Fixed icc/icc.c to properly support the
possibility of a full set of intent Luts in
display and input profiles. (Profile does
not yet support intents for input profiles.)
* Added new intent to link/icclink and profile/profile.c,
that does an absolute colorimetric link, but
will scale the brightness down if needed to
avoid clipping the source white point. This
is useful in soft-proofing situatations.
* Went through with both gcc -Wall, and Vc++ -w3
and reduced the number of waring messages.
Fixed some very minor bugs along the way.
* Made additional changes to spectro/dispcal.c, to
improve behaviour when adjusting controls with and
without targets. When adjusting without a white target,
the control hints now help you adjust to be on
the chosen black body or daylight locus.
* Changed profile smoothing factors that are different
for the L* a* and b* channels.
* Made profile/profile.c label the profile with the platform
it was created on.
* Improved the device model used by dispcal, including
optimising the model, so that it zero's in on
calibration faster, and handles the black point
more accurately. Added a variable -k option to
dispcal.
* Added display controls addjustment mode to dispcal,
and altered the target gamma curve to better take the
black point into account.
* Added report option to dispcal, to measure and report on
the current display behaviour.
* Added verification mode to dispcal (-E), to
allow checking how well a display meets its calibration
targets.
* Added -N option to dispcal, dispread and spotread to
allow instrument calibration to be bypassed. This makes
repeatedly operating some instruments (ie. Spectrolino)
more convenient in emission mode.
* Added a "load video LUT" mode to dispwin, so it can now
be used to initialse the displays from either ICC profiles,
or Argyll .cal files. Can be used on all platforms (but
particularly MSWindows and X11) in startup scripts.
* Fixed bug in X11 disable screensaver, and disabled
the cursor over the test window.
* Added proper multiscreen support on all platforms
(Even X11 Xinerama!).
* Fixed bug in dispcal that was causing the achievable
brightness calculation to misbehave.
* Added -u "update" option to dispcal, to speed up
maintenance of display calibration.
* Added separate options in dispcal for a daylight or
black body color temperature target.
* Added "plot spectra" option to spotread.
* Added support for the X-Rite DTP94 (AKA OPTIX) to spotread, dispcal,
dispread. Added -y option to allow specifying whether a CRT or LCD
is being read.
* Streamlined instalation (particularly on Unix and OSX),
so that tifflib and libusb don't need special handling.
Changes to Jambase to accomodate this.
* Added support for USB connected instruments using libusb.
* Added support in profile/logo2cgats for converting from
X-Rite ColorPort format.
* Added extra facilities to imdi to suppport arbitrary
colorant order, arbitrary pixel padding, reduced
runtime code size and improved cross platform
compatibility.
* Added warnings in all the instrument driver
code, that instrument companies are not to be
expected to support anything involving these drivers.
* Completed new version of cctiff, that deals with an
arbitrary sequence of profiles, as well as supporting
L*a*B* encoded TIFF I/O.
* Added alternate sort algorithm to imdi/cgen.c, for
16 bit input support, speeding up higher dimensional
input conversions.
* Changed icc/iccdump so that the -t parameter can
be specified multiple times.
* Added extra PCS curve for BtoA table of XYZ LUT
profiles :- this greatly improves the accuracy
of the BtoA lookup of XYZ LUT profiles.
* Added greytiff utlity to binary distribution,
and also added option to convert using CIECAM02
space, for lighter chromatic colors.
* Added ColorantTable tag to profiles created by
profile/profile.
* Added a new option to dispcal and dispread, to allow
the test window to be positioned and sized. This
allows some people to cope with multiple displays
better, and may give some flexibility in applying
these utilities to projectors etc.
* Added three stage overal conversions to icc/icclib.c,
for monochrome, matrix and lut conversion classes.
This is to make it convenient to split up every conversion
into input per component, core intercomponent conversion,
and per component output, to match the capabilities
of imdi.
* Modifed xicc/xicclu, xicc/revfix.c, profile/profile.c
and link/icclink.c, to default the -k black generation
to setting black level targets, instead of locus targets.
In pratcice it seems easier to create smooth black curves
this way, especially when meshing with the black behaviour
forced by ink limits and L target levels.
Backward compatibility with the previous controls is provided
via the -K flag. Default black generation has generally
been switched to -kr. xicc/xicclu has had the -kq option
added, so that the behaviour of icclink -kq can be
explored. Some bugs in -kq may have been fixed.
* Added full verbosity levels to icc/icclu and xicc/icclu,
so that -v0 can be used to capture batch output that
is ready for further batch processing.
* Enabled proper gamut tag creation in profiles.
* Fixed numerical issue in xicc/xicc.c:icxdCIE94sq(),
that was causing profile to fail when optimising
matrix and curves.
* Bumped up the default profile smoothing factors,
as the resulting gamut boundaries were noticably
bumpy. Default profile -r is 0.5%, and internal
factors within rspl/scat.c have also been increased.
This seems to be favouring smoothness over accuracy
somewhat, but is still on the shallow part of the
"knee", where further increasing smoothness would
start to strongly decrease fit.
* Fixed problem in profile (xicc/xlut.c) in locating
the black point. Doing one search is not robust
given the behaviour of many profiles, so
several searches are now used to avoid local
minima. The same fix is applied to xicc/mpp.c
(Thanks to Gerhard Fuernkranz for discovering
the problem.)
* Fixed target/targen, link/icclink, xicc/iccgamut,
xicc/fakeCMY, xicc/revfx, xicc/xfbview and xicc/xicclu
to have estimated default ink limit values. Added input
profile ink limit options to link/icclink.
* Added a function to icc/icc.c to estimate the
total link limit and per channel limits of
an ICC profile. This is to workaround the lack
of a standard tag in the ICC profiles.
A function built on top of this in xicc/xicc.c
(icxDefaultLimits()) established default total
and black ink limits for a profile.
* Modified gammap.c & nearsmth.c to increase
the control over gamut mapping, and add new features.
The controll weightings within gammap.c are now
tables rather than #defines, and can be segmented
by color, to fine tune particular areas. Only
yellow uses this feature, to keep the gamut mapping
universal. Two aditional features have been added,
cusp mapping, that applies a degree of rotation to
areas surounding source primary/secondary colorant
cusps to partially align them with the destination
cusps. The radius of influence of this mapping is
settable. Another factor called "elevation" has been
added, that simulates the effect of inflating the
source gamut, allowing more complience in the
mapping of the control vectors.
Just perceptual and saturation tables are present.
In nearsmth, expansion of the gamut is finessed a little
by termporarily reversing the direction of the mapping
when expansion is present. There are lots of
other changes in nearsmth.c aimed at improving the robustness
and behaviour of the nearsmooth function.
The gammap tuning factors are aimed at providing good saturation
while maintaining smoothness at the gamut surface.
* Added code to the gamut hull finding, to locate and
store the primary and secondary colorant "cusps" in
the gamut file, as well as adding options to
the various vrml utilities to mark the cusps.
The cusps can be used within the new gamut mapping
to align or partially align the colorants
of the source to the destination.
* Modified gamut boundary code to improve detail and acuracy
of the gamut hulls. The smoothness of the destination
hull affects the smoothness of the resulting gamut
mapping to some degree.
* Changed gamut mapping so that "full" neutral axis alignment
no longer aligns the black point a*b* to the destination.
The L/J range is mapped as if the black points are
fully aligned, so the contrast ratio is not compromised.
This approach seems to give a better subjective neutral result.
(There appears to be no such thing as black point hue adaptation.)
* Modified enumerated viewing conditions list to tweak
ambient values slihtly, and introduce "monitor in bright
work environment".
* Added new option to spectro/fakeread to allow manipulation
of the black point of the fake readings, to allow creation
of test profiles with different black points.
* Added another numerical problem workaround to
xicc/cam02.c, to deal with Jab->XYZ issues when J == 0
* Created utility render/itest to generate RGB test images
for checking gamut mapping behaviour.
* Created new sub project "render", for a simple 2d raster rendering
system. This is intended for use in generating test images, as
well as rendering measurment test charts directly to rasters,
rather than just postscript.
* Added a -m option to target/printtarg, so that the paper margins
can be increased from the default.
* Added documentation for the .ti3 and .cal file formats.
* Fixed bug in spectro/unixio.c, which caused long strips read
on the DTP41 on OSX or Linux to fail when spectral readings
were enabled. The canonical input buffer size was being exceeded.
Switched to non-canonical input mode. (Also seemed to fix
problem with Xon/Xoff flow control on OSX.)
* Added flow control to serio I/O, to make instrument
communications more robust. Hardware handshaking
seems to be the most reliable (but see above).
* Converted icc/fbtest into profile/invprofcheck,
and added some more features to make it comparible to
profile/profcheck.
* Added VRML L*a*b* axis labels to gamut/viewgam, profile/*profcheck.
* Increased gamut mapping RSPL smoothness, to compensate for
RSPL changes in V0.53. Smooths out bumps in saturation mapping
somewhat better, and should eliminate the "non-monotonic" warning
message.
Version 0.53 changes (December 2005)
--------------------
* Fixed serious bug in target/ofps.c, that made
the default distribution of points very non-optimal.
* Added CIEDE2000 Delta E function to icc/icc.c, and
also added this as an option to profile/profcheck,
profile/mppcheck and profile/verify.
* Added new utilities rspl/smtmpp.c and profile/splitcgats.c
to allow testing and verification of profile optimised smoothness
factors with more realistic device data. Use splitcgats in
combination with profcheck and the hidden "-rs" flag in
profile to cross validate the optimised smoothness factors.
* Added new "-r" parameter to profile/profile to allow
the profile smoothness factor to be adjusted to suite
the uncertaintly of the device and instrument readings.
* Created more in depth simulation of device behaviour to
verify profiling operation (rspl/smtnd.c). Running this
indicated that no single smoothness factor will suite
all combinations of dimension, number of sample points
and sample point uncertainty. Create a interpolation table
lookup to provide an "optimised" smoothness factor,
determined from the simulations. Used new profile/splitcgats
to cross validate
* Fixed serious bug in rspl/scat.c - new smoothness tracking
factors were seriously wrong. Figured out correct approach
and fixed it. Will affect various components including
profile, icclink and refine.
* Added support for hexagonal layout of charts on XY instruments.
Supports aprox 14% more patches on the same sized chart.
Changed default patch size for Spectrolino to 7mm, since
this fits more patches on a page while remaining more
reliable than the 6mm patches used in charts such as the
ECI2002. (Changes to target/printtarg and spectro/printread)
* Added extra check code for argument handling in link/icclink.c
- we now switch to appropriate linking mode if options that
require it are selected.
* Added better algorithm for weakly tending rspl's to
a particular mapping. Added weak default function
API to scattered fit, and now make use of this
in tweak/refine. This should eliminate an "overshoot"
issue that was present with the simple grid of weak
mapping points previously used (Thanks to Gerhard Fuernkranz
for pointing out the problem.) Affects tweak/refine.
tweak/refine has also been afected by problems with RSPL
scattered data fit functionality - see above.
* Modified spectro/dispcal.c to more acurately compute clip
of target white with device gamut, and also use matrix to
compute aprox. inverse more quickly and acurately, to
give faster and more accurate convergence. Needs some
more testing, may not work well on real monitors ?
* Started adding support for ICC V4 Lab encoding into icc.c
Version 0.52 changes
--------------------
* Added a display calibration utility, dispcal,
to create appropriate display lookup curves.
Modified dispread and profile to carry the display
curves through to the vcgt tag in the profile.
Not extensively tested yet.
* Added spectro/spec2cie.c from Gerhard Fuernkranz.
* Changed clut profile input and output curve optimisation
code to use conjgrad() instead of powell(). Aim was to
speed up profiling, but speed seems to be about even.
Added "optimise all" step since conjgrad() makes this
feasible, getting slightly better fit.
* Modified the rspl code to support non-equal grid resolutions.
This was to support display calibration, but may come in handy
for support of V4 profiles. Noticed that the smoothness tracking
with different resolutions and dimensions wasn't working very well.
Improved the test code (c1, t2d, t3d) to help reveal this, and
fixed the problem. Now operates faster, more accurately, more
smooth output with a better fit to the input points. Should
improve the quality of forward profiles somewhat.
The fitting error is more noticably improved from -ql through -qu.
Gamut mapping seems to be a little smoother.
* Completed the tweak/refine tool, useful for improving the accuracy
of proofing systems. Changes were made to profile, icclink and
revfix to support simple use of abstract correction profiles created
using refine.
* Added option to printread, to allow CIE data to be saved
as D50 L*a*b*, for more flexibility for other purposes.
* Fixed minor bug in DTP51 reading, where the guide setting
was wrong for strips with less than the 6 passes.
Also added fix code for DTP51 "off by one" patch
problem - the error should be corrected automatically.
* Fixed problem in reverse lookup of per channel curves,
that affected performance of profile and icclink -G.
This problem became evident when CAM was switched to CIECAM02.
Note this problem seems only significant when CIECAM02 is used,
ie. when the -c and -d flags are used to specify viewing conditions.
* Added support for alternate test patch indexing, to
better support non Argyll test charts (ie. ECI2002)
* Renamed printspot to spotread, and expanded the range
of instrument modes supported.
* Added emmisive measurement mode support to printspot.
* Added independent Gretag Spectrlino/SpectroScan
interface library to cleanup some minor problems,
and add some more features (such as a fake transmission
measurement mode using a light table, etc.)
* Added extra option to targen that allows creating test
points targetted at a specified portion of the devices
colorspace.
* Fixed problem with imid & cctiff, where a profile that returns
device values > 1.0 causes pixel value wraparound.
* Added an extra option to printtarg to scale the size of the test
patches. This can be used to allow for coarse screening, poor
registration, and packing more test patches onto a page.
* Added extra support in fakeread to allow monochrome test charts to
be faked using RGB/CMYK profiles.
* Added extra options to printtarg, to allow greyscale test charts to
be represented in a number of different postscript color representations.
* Fixed bug in targen when > 4 colorants are used, and -v is turned on.
Diagnostic fails for > 4 colorants. (Thanks to Andrej Javorsek).
* Fixed bugs in matrix/shaper profiling :- -ve offsets in shaper don't
make any sense, so removed them; weighting of parameter values was
faulty, so suppression of unsconstrained bumps in curves wasn't always
effective. This change may improve matrix/shaper profile quality slightly.
Version 0.51 changes
--------------------
* Added new option to xicc/xicclu to allow plotting of the neutral
axis to examine black generation behaviour.
* scanin has problems with new correlation code. Revert to
old code until problems are figured out.
* Added support for a black channel ink limit
in nearly all utilities that currently support
a total ink limit.
* Created cam02plot to explore discontinuities in
CIECAM02 conversions. To support this, the usage
of Helmholtz-Kohlraush effect is now a runtime flag.
* A few changes in icc/ moving towards V4 support
* Modify Jamfiles to support a more restricted "install" of
executables and other files to bin/
Version 0.5 changes
-------------------
* Got the GUI and serial coms dependent parts running
under Mac OSX. Changes to Jambase and Jamfiles to make this work.
* Modified Jambase to allow for Mac OSX Carbon GUI applications
needing a minimal resource fork to run properly.
* Added incremental rspl scattered point suport, to allow
for us in an error driven targen point generation routine.
* Added "EXTRAFIT" option to rspl, that allows for better fitting
to scattered data points that have a high error after normal
fitting. May improve profile accuracy when large test charts are used.
* Add a special purpose "-f" and "-F" option to icclink, that causes
K only or all output for RGB/CMY in to CMYK out devices for neutral
(R=G=B) input.
* Switched around gamut mapping high level controls into
a simple "Perceptual" and "Saturation" set of pre-canned
surface point weighting values. This allows more detail
in setting the two different styles. A saturation enhancement
control has also been made available, although this may need
a little more work to be fully effective.
* Switched over to CIECAM02 for better blue gamut mappings.
Fix CIECAM02 so that it is robust given arbitrary Jab input values.
* Fixed bug in gretag spectroscan print chart reader - it wasn't
recalibrating every 50 readings.
* Added support in spectro/fakeread.c for a "separation" device
link profile to preceed the real device profile. This allows
simulating the response of a device that used an explicit
separation in its rendering pipeline.
* Creating a hack CMY to CMYK separation creation support tool
called xicc/fakeCMY.c This creates a dummy CMY->PCS .ti3 file
from a CMYK device profile, that can then be turned into a CMY
device profile that can then be linked with the CMYK device profile
to create a CMY->CMYK device link separation profile. This program
will be redundant when profile/sepgen is completed.
* Add support for the Spectrocam illuminant spectrum (Xenon Lamp),
even though this instrument is not supported directly. This
allows the FWA to be used on spectral readings from this instrument.
(Thanks to Gerhard Fuernkranz for providing this information).
* Add method to gamut object to compute a gamuts volume,
and report the total volume in xicc/iccgamut if verbose
is set.
* Modified scanin to work with scan of Gretag ColorCheckerDC.
Needed to modify edge detection filter to reduce noise,
modify edge matching code to support a wider range of
scales, change matching logic to ignore target edges
with no matching reference edge, stop using crossings
as part of edge matching.
* Added new entries to test chart recognition template, to
allow scanin to determine correct rotation, even when the
chart has no asymetric elements. This works similarly
to the strip reading code, in checking correlation
between expected and measured color values.
Printtarg has also been modified to support
this new scan recognition template entries.
* Fixed up Gretag Spectroscan operation so that
emission readings (for displays) etc. modes are
correctly set and calibrated.
* Added new facility to cgats library, to allow for a
wildcard table keyword, as well as a variable "CGATS.XX"
table keyword.
* Switched to CIE94 delta E for shaper/matrix profile
model fitting.
* Introduce new flag ICX_CAM_CLIP to xicc, to allow full
accuracy lookups within gamut, and clipping in CAM Jab space
for out of gamut values. Turned this flag on in profile/profile,
to improve clipping behaviour of colorimetric B2A table, and
in link/icclink, to do the same for absolute and appearance
indents.
* fix argument '-t' processing error in profile/profile.c
* gamut/gammap.c: Change over to better vector alignment code.
* Improved some of the black point handling precision in icclink
to reduce some innacuracies noticed by Gerhard Fuernkranz.
* Modified Absolute Appearance intent to use
a common white point between the input and
output profiles, as well as scaling it to
Y = 1.0, to try and prevent Jab values
exceeding J = 100.0
* Improved profile/logo2cgats to cope with the latest
formats of data files from Gretag. They seems to
have moved over to including the device values in
the readings file, just like Argyll :-).
* Changed rspl/rev.c so that instead of failing
when it runs out of room to cache all the cells
being searched in a query, it proceeds with the
search in chunks. This allows the memory usage to
be curtailed, without risking the reverse lookup
being aborted. There will be a slight performance
loss if this happens though.
* Fixed imdi/cctiff when linking profiles,
to not use explicit per channel curves when
the PCS is XYZ. This was causing excessive
quantization, because XYZ is a non-perceptual
space. (Same problem noticed in link/icclink some
time ago!)
* Fixed old bug in target/ppoint.c,
that caused a crash under Linux in targen.
(Thanks to Greg Sullivan for bringing this to my attention.)
* Improved robustness of cam97s3 some more,
some cases encountered in b2a table creation
triggered problems with out of range values.
* Added grid range override for gamut creation,
to assist uniform handling of gamut compression
in b2a table creation.
* Added perceptual and saturation gamut mapping
support to the profile creator (profile.c,
profout.c). This takes an input profile as a parameter,
to determine the necessary gamut mapping.
* Added new function to icclib to allow setting
of up to 3 Lut tags simultaniously.
This is to allow the multiple intent B2A table
values to be set while getting the best possible speed
of inverse A2B lookup.
* Added two new functions (fwd_relpcs_outpcs,
bwd_outpcs_relpcs) to xicclu, to allow
converting between native relative PCS and the
appearance space configured in the space conversion.
This is to allow converting to/from source/destination
CAM Jab space for gamut mapping during profile creation.
* 2003/12/9 Unstable release
* Started HTML documentation in the doc directory.
This is work in progress, and is not yet complete.
See doc/Index.html
* Changed per channel curve algorithm in xicc/profout.c,
xicc/mpp.c and xicc/xmatrix.c, to improve accuracy
of profile, and markedly reduce "wiggles" in certain
cases, as well as improving the accuracy of the
profile compared to the "true" underlying device
characteristic. Changed how the white point is preserved
once again, this time by simply adjusting the order 0
a*b* curve harmonic to map 0.0 to 0.0. Tuned curve
weighting. Checked that the rspl scatterd data smoothing
default is still an approproate compromise.
* Added support for a TI3 file as reference for
profile/fakeread, to improve reference set generation.
* Fixed a bug that was causing the A2B output curve
ranges to be excessive (160%, rather than the intended
110%). Altered profile/profile.c to remove the code that disables
the use of A2B output curves when a high quality B2A is needed,
now that there is a way of ensuring that the a*b* curves go
through 0.0.
* Tweaked xicc/mpp.c to improve accuracy with
a very small number of points, by improving the
sophistication of its estimation of ink 100% overlap
values in the "anchor points" (which become defaults
if measured values are missing), as well as strengthening
the weight given to minimising the transfer curve and
ink interaction "shape" values.
* Added comment support in icclink, similar
to that in profile.
* Added support for MPP profile in profile/fakeread,
to permit a simple way of creating an ICC profile
from an MPP profile for <= 4 colorants. Spectral
values can be generated using an MPP profile.
This provides a path to creating a useful
profile when very few measurements are available.
* Changed -n flag in profile/profile.c to allow
disabling input (-ni) and/or output (-no) clut lut
curves. This allows testing of the effects of
per channel curves.
* Added -r flag to link/icclink.c to allow
overriding the device link clut resolution.
* Add some filtering to the K locus curve
generation in profile, icclink etc., to smooth
out mixing behaviour. Transition to ink limiting
isn't smoothed at the moment.
This may improve problems with banded colorization,
but only if high resolution, reverse AtoB linking
is being performed.
* Correct Gamut boundary table support has been added
to profile/profout.c, but isn't enabled or debugged yet.
* Add spectral lookup support to mpplu.c utility.
* Fix bug in spectro/dispread.c - we hadn't
updated it for the latest .ti1 format.
* Added a special "simple" mpp model mode
to profile/mpprof.c and xicc/mpp.c,
to support a more simple Neugenbauer
like model for possible proofing standards use.
* Added support in diagnostic plot for up to 6 curves,
with do_plot6() function.
* Disable USE_MERGE_CLUT_OPT from icclink, since
it compromises accuracy, without a noticable
improvement in speed.
* Added simple link support into cctiff
for convenience, and to serve as an
example of how to link and convert pixel data
in one step.
* 2003/4/23 Unstable release
* Modify gamut/gamut.c to #undefine ADD_EXTRA. This
code doesn't seem to add much, and seems to go
crazy with some profiles, using endless amounts
of memory.
* Changed rev.c allocation code to make sure
doubles get allocated on their natural boundaries.
This may fix problems with some processors (MIPS).
(Thanks to Daniel Borenstein for pointing out the issue.).
* Changed Absolute intent to clip in CIECAM97 space,
for improved out of gamut color handling.
(link/icclink.c, xicc/xicc.h, xicc/xicc.c, xicc/xlut.x xicc/xicclu.x).
CIECAM97 is tricked into an absolute mode
by forcing a D50 adapted white point for both source
and destination profiles. The other appearance
parameters still have an effect.
* Hopefully removed the last problems involving
the confusion about whether RGB device values ranges
are 0-100 or 0-255. Argyll should now be consistent
in using 0-100 for all its CGATS data files.
[Changes mainly to scanin/scanin.c, plus warning
code in profile/profout.c and profile/profin.c]
* Added support in targen for using an mpp model
to set test point distribution.
* MPP profile format and creation now complete.
Using much more complicated derivative minimisation
equations to get adequate speed out of it.
Overall accuracy of the profiles hasn't yet been
established.
* 2003/2/8 Unstable release
* Added a slight refinement to the CIECAM97 model -
rather than using linear interpolation for computing
the eccentricity factor, use a spline blend
to smooth out the slight "kink" at the
knot points.
* Updates mpp.c - work in progress.
* 2002/12/25 Unstable release
* Completed Gretag Macbeth Spectroscan support
for print profiling. Most changess in spectro/printread.c,
spectro/gretag.[ch] and spectro/spm.[ch].
* Tuned gamut mapping to improve perceptual. Fixed
gamut/gammap.c so that separate luminance, chrominance
and hue weighting works properly. Added variable chrominance
weighting so that blues will be mapped with high L weight,
while yellows will map to closest. This exploits the
extra blue lightness added by allowing for the
Helmholtz-Kohlraush effect in conversion to CIECAM97 Jab
colorspace. Tweaked xicc/xicc.c gamut mapping control
parameters to improve perceptual and saturation
gamut mapping. Made extra gamut mapping surface point code
in gamut/gamut.c more robust so that it can be turned
on by default (since disabled again).
* Added Helmholtz-Kohlraush effect modeling
in xicc/cam97s3, using the equation from
Bradford-Hunt 96C, as detailed in Mark Fairchilds
"Color Appearance Models". CIECAM97 was derived
from Bradford-Hunt 96S Simple model.
It turns out that this effect is crucuial in
gamut mapping CRT blues onto printing blues,
and making sure that they take into account
the subjective lightness of the highly saturated
CRT blue.
* Added more elaborate "thru Black" controll to
link/icclink.c, allowing a CMYK to CMYK with a partial
through black. This is implemented using two
"upper" and "lower" limit black generation curves.
* Added hack program profile/logo3 to
allow for a smaller number of test
sheets read on the Spectrolino.
* Added new test point generation module
target/ifarp.c, an "Incremental Far Point"
generation algorithm, intended for N dimention
test chart generation. This is none too quick, but
seems to generate reasonably well distributed
test points at a steady rate. Any reasonable
algorithm in N dimensions needs to create test
points starting with some in gamut "seed" point,
as the valid gamut space becomes smaller and smaller
as N increases.
* 2002/12/2 Unstable release
* Increased imdi code to handle at least
8 channels in and out.
Added tables to generate all
possible dimension combinations
in and out from 3 to 8.
Added -q and -s flags to itest to
increase testing speed.
* Added full 16 bit processing support
to the imdi code. This also allows
the handling of > 4 channel input conversions.
Configured generation of 8 bit to 16 bit
conversion kernels. The per channel output
table value is 16 bits, useful for final device
linearisation without the penalty of 16 bit
precision thruout.
Cleaned up the cgen code to more gracefully
handle the differences between sort and simplex
table code, as well as better handle 64 bit
capability properly.
* Changes imdi_gen to, by default generate
all the imdi kernel code in a single
file, reducing clutter. The -i flag
invokes the previous behaviour.
* Added -w flag to icclink, which enables
a white point matching hack during linking.
If set, the white points are forced to match
regardless of the intent or gamut mapping.
* Modified rspl to separate out the functions
that are limited in the maximum input
dimensions, and those that aren't,
so that some rspl functionality can
be used with larger numbers of colors.
This translates through to increased number
of colors support in some of xicc.
* Fixed memory leak in imdi/imdi_tab.c
(thanks to Krzysztof Spera)
* Merged back basic changes to support compiling
under Mac OSX. GUI and serial port dependent
code isn't finished though.
* Made allowance in CGATS and icc
library for compiling without support
of the usual system file and memory
allocation calls, to increase flexibility
when using these libraries in non
standard environments.
* Changed CGATS library to support
alternate allocator and/or file I/O,
for broader system compatibiliy.
Added error return codes for all methods,
to eliminate any calls to error().
Added new method error() to avoid having to
check every method for a return code.
* Finished first cut at the model printer profile
object (xicc/mpp.[ch], profile/mpprof.c),
that supports profiling N color printing devices.
Note that ink modeling is not supported at the moment,
but there is enough support for optimised seprations.
* Added -u flag to profile/profile,
that forces input Lut based profiles
to be stored as an absolute profile.
This is non-standard, but very useful for
avoiding Lab range clipping when using
a scanner as a colorimiter.
* Added hack program profile/logo4 to
convert four separate spectral files read
using the logo software, to a single
argyll .ti3 file. This won't be needed
once Argyll can run the SpectroScan
directly.
* Added numerical library support for
a Sobol sub-random multi-dimentional
sequence generator, to support an
alternate means of creating greater than
4 dimentional test chart values, plus
first cut point support using it in
target/qrand.c (This doesn't seem useful in
practice though.)
* Added -s option to iccdump to enable
searching and dumping embedded profiles.
* Fix bug in profile white point adjustment
(xlut.c). The actual white point didn't
match the specified white point to the degree
of accuracy desired. There may also have been
issues with clipping values in Lab PCS.
* Added option to spectral to CIE module to
compensate for the presense of FWA (Fluorescent
Whitener Additive) in paper. This improves the
accuracy of the CIE color values when a media
measured under one illuminant is going to be
viewer under a different illuminant. This works
if you are using a spectral measurment instrument.
(See poster in proceedings of the IS&T/SID
11th Color Imaging Conference, November 2003 page 248).
* Added shaper/matrix input profile support.
(profile/profin.c, xicc/xmatrix.c)
This may be more accurate for scanner profiles,
given the poor coverage of test points provided
by an IT8 chart (but doesn't appear to be in practice).
* Added support in scanin.c and scanrd.c for
processing 16 bit TIFFs, allowing for higher
precision scans (useful when using the scanner as
a crude colorimeter).
* Added support in scanin.c and scanrd.c for
using a scan of a print test chart, plus a
profile for the scanner, to act as a crude
colorimeter in printer calibration. This
new mode handles multi-page test charts.
* Added support in printtarg, for producing a scan
recognition template (.cht) for each page.
* Added patch optimisation module to target/printtarg,
to arrange patches to maximise their contrast for
strip reading instruments.
* Removed the color directory, since it's functionality
has been taken over by the xcolorants library,
and the (yet to be completed) MPP profile library.
* Added DTP41T (tranmission) support in target/printtarg.c
and spectro/printread.c etc.
* Made changes to target/targen.c, target/printtarg.c
and spectro/printread.c to be able to generate
and then read >4 color test charts, to be able to
characterise 6 to 8 color devices.
* Added support in xicc/xspect.c for measuring
StatusT and Visual density from a spectral
reading, as well as an aproximate XYZ to
density conversion, to support spectrometer
patch spacer contrast determination.
Also added an XYZ to sRGB conversion
function to support RGB previews of N color
devices, as well as scanner recognition template files.
* Expanded xicc/xcolorants.c to incorporate
an approximate device model for arbitrary
colorant combinations. This is used to
be able to approximate expected density readings,
as well as preview colors and scanner recognition templates.
* Create a new test point creation module,
target/simplat.c, to create higher dimentional,
regular simplex latice test pointsi (this seems
rather slow and has difficulty arriving at the
desired number of test points.)
Fourth snapshot changes:
------------------------
* Removed gamut/iccgamut, and renamed
xicc/xiccgamut to xicc/iccgamut.
* Modified tiffgamut to be able to emit CIECAM97 style
colorspace gamuts, so that it can be used to
generate appropriate gamut files as input to
icclink. Moved it to the xicc subdirectory,
as it depends on xicc, just like xiccgamut.
* Fixed up icclink.c, gammap.c and nearsmth.c to
more correctly handle gammut mapping for a particular
image gamut, rather than a source colorspace.
* Added text description option to profile utility.
* Made significant modifications to the perceptual
gamut mapping. Turned gammap into an object, rather
than merely returning a rspl to allow for a separate
L mapping step. Added #define to control this.
Made the source to destination surface point a weighted
optimisation algorithm for more control over the absolute
vs. relative error introduced, and setup some initial
weighting values. This is intended to combat the
tendency of the "smallest absolute error" mapping
to map many to one in the most saturated regions,
leading to a loss of detail. The weighting scheme
could probably use some more fine tuning, or even
some alteration to make it vary with respect to (say)
the absolute L value, or the absolute C value.
* Added first cut at a model based forward profile
creation (profile/mpprof.c). This is intended for
profiling 6 or more color devices, and using as
the profile driving optimised separations.
* Added xcolorants resource to allow specifying and defining
device colorant combinations. This is needed as a foundation
to profiling 6 or more color printing devices.
* Tweaked targen to concentrate test patch points
at regions of higher curvature. This should improve profiling
efficiency slightly.
* Fix bug in xlut.c where creating a gamut cleared
any ink limit set on a rspl. This caused the ink limit
to be ignored in any icclink that used gamut mapping.
* Modified printtarg.c to try and get more reliable
DTP41 operation. Switch to black and white patch
spacers by default. It's difficult to know what the
instrument really requires to reliably pick up
the test spacers.
* Fixed bug in gamut where it was still hanging on to
vertex points that disapear below the log convex hull.
This has no consequences.
* Added option in icclink to allow specifying an explicit source
gamut for the gamut mapping. This allows tailoring the gamut
compression to be optimised for a particular image.
* Added profile checking utility, that checks measured device points
against an icc profile.
* Fixed probem with linking when any of the profiles native PCS is XYX.
The device linearisation curve should not be preserved if the
native device profile PCS is XYZ.
* Fixed bug in xmatrix.c & xmono.c when finding the gamuts of
matrix and mono transforms when a Bwd transform is used.
Showed up in icclink when the output profile was a matrix
of monochrome transform.
* Fixed bug in icclib when PCS overide is used with a
Bwd transform. Similar problem to above for matrix & mono
profiles, but at the icclib level.
* Added function in icclink.c to allow the generation of
a device linearisation curve for XYZ profiles. This was
expected to improve the result when linking to XYZ profiles,
but currently seems to make things worse. This feature is
therefore off by default. :-( (This should be changed
to work the same as the current xlut.c profile code!)
* Added preliminary support in printtarg for the SpectroScan
spectrodensitometer. Also added preliminary support for
scanner recognisable test charts.
* Added option to icclink to turn off the use of linearisation
curves in the output link, since this sometimes seems to
make the accuracy worse given profiles with odd device
linearisation curves.
* Added custom page size support to printtarg.
* Modified icc library defines to use INR32 rather than INT32
definition, to avoid clashes with system typdefs etc.
* Added CIE94 delta E support to profchek utility, changed
peak reading to be peak delta E rather than peak individual
L, a or b, and made the same change in the check code
in profout.c
* Added utility to do reflective spot readings using appropriate
instrument (printspot). DTP41 supported.
* Fixed bug in profile.c that meant that the spectral mode
was ignored unless an observer was specified (ie. it wasn't
defaulting to 1978_2).
* Modified targen.c so that when a previous profile is used
to pre-condition test points, the neutral axis has a higher
density of points, in line with the higher sensitivity the
CIE94 delta E formula has in this region. This should improve
the tolerance of the resulting profile in the important
neutral gray area.
* Fixed bug in printread.c that is triggered when more than
26 strips are being read.
* Modified targen.c so that the 4 dimentional auxiliary chanel
weighting (ie. K chanel in CMYK) is 150% of the Lab spacing,
rather than being 50% of it, when ICC profile pre-conditioning
is being used. This seems to improve both the worst case, and
average error of the resulting profile for at least some devices.
* Switched to (now working) xlut2.c code, for creating clut
based profiles. This version creates both input and output
1D luts by optimising the accuracy of the profile for a linear clut.
The result seems to be more accurate profiles, since the underlying
device characteristic is better modeled. It also seems to aleviate
some of the issues when linking and preserving the device 1D luts
in the linked profile.
* Added verification function to icclink.c, to check the
accuracy of a link profile.
* Fixed numsup.c 2d array malloc/free to be more efficient
by allocating the main array as a single block.
* Fixed bugs in handling XYZ lut based profiles.
* Fixed bug in setting white and black points for input
profiles.
* Added support for selecting algorithm type for all
types of profiles - input, display and output.
(XYZ lut doesn't seem to work properly yet though!)
* Merged Raph Levien's cleanups to icc.c, to quiet gcc
warnings.
* Improved new xlut2.c to handle pathalogical input data
from gridded charts. The order of the curves is now
adjusted so that it is not greater than what can
be supported by the data. Also changed shaper curve
parameter action to be more progressive, and tied
the parameters into the optimisation goal so that
parameters that have no effect are minimised, resulting
in less "ringing". Fixed bug in shaper curve transform
that was clipping parameters, resulting in gross errors
before the white point was exactly fixed on.
* Added new features to profcheck: Sorting feature to
indicate support for a particular device->pcs value,
+ VRML output of errors between profile and datapoints.
* Modified scanin/scanrd to allow for Grey and CMYK .tiff
files, as well as just outputing a CGATS data file,
rather than only performing the data collection needed
for and RGB scan calibration. This is useful for capturing
the patch values from a test chart only available as a
TIFF file. Removed automatic extention stuff.
* Added black wedge generation to targen, and extra checking
to elminate redundant test patches.
* Added EPS output support to printtarg.
* Added a couple of options to cctiff to aid diagnostics.
Third snapshot changes:
----------------------
* Changed targen to allow full spread test points to take account
of the others sorts of test points.
* Changed icclib to use the Bradford chromatic adaption for
white point shifting in profile creation and absolute profiles
lookup. This creates some minor incompatiblity with profiles
produced with earlier versions, but is likely to be more
compatible with other CMMs.
* Added support in icclib for abstract file accesor type (icmFile), and included
implementations for standard file and memory image.
* Added support in icclib for abstract memory allocator, and included
implementation for standard alloc/free.
* 25/2/2001 Changed targen to use ICC profile for perceptual even
point generation. Includes support for Gray and RGB as well as CMYK
perceptual support.
* Film profiling using the Spectroscan-T care of Niel Okamoto.
* Print charts suitable for the Xrite DTP41 are
now supported, and print chart reading using the DTP41
is now supported.
* Added DTP92 support and Lut and matrix profile support for
display profiles.
* Added spectral reading support to the DTP41 readings.
* Added support in profile for using spectral data with choice
of observers and builtin or loadable illuminant spectra.
* Modified the gammap code to precicely match the white and black
points. Solves "background color" problems in linking RGB and CMYK etc.
* Changed K generation curve parameters to be easier to control.
Have two breakpoints and curve shape along the luminance axis.
* Added more sophisticated auxiliary chanel locus finder in rspl/rev.c,
to be able to detect profile anomolies (not made use of in current code).
* Added underlying support for optimised separations into
4 to 8 separations in rspl/opt.[ch] . This is intended to be
used internally as an option for driving a CMYK device, and
also explicitly to support 6 or more color devices. Not tested
or made use of just yet.
* Added development area for Java GUI development. The intention
is to use Java as a sophisticated scripting front end, to
make the command line commands more palatable.
Second snapshot changes:
----------------------
Neil Okamoto has contributed support for generating
RGB TIFF targets suitable for film recorder output,
as well as Gretag Spectrolino support for reading them
in again.
The target patch generation now uses ICC profile to
pre-condition the test points. This now works for
RGB and Grey targets.
Finished port to Linux.
Cleaned up build automation somewhat.
Added RGB output device profile generation support.
Added RGB scanner device profile generation support.
Added a couple of spectrometer conversion utilities for
raw data files from other CMSs.
Added gamut boundary mapping and visualization tools (VRML)
Added CIECAM97s Color Appearance Model (CAM) colorspace support.
Added experimental gamut mapping code.
Enhanced linker to use CAM and gamut mapping.
Numerous bug fixes and enhancement.
