<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Operation of particular instruments</title> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body> <h2><u>Operation of particular instruments</u></h2> <br> The following instruments are directly supported:<br> <br> X-Rite:<br> <a href="#dtp20">DTP20 "Pulse"</a> - "swipe" type reflective spectrometer, that can be used untethered.<br> DTP22 Digital Swatchbook - spot type reflective spectrometer.<br> DTP41 - spot and strip reading reflective spectrometer.<br> DTP41T - spot and strip reading reflective/tranmissive spectrometer.<br> <a href="#dtp51">DTP51</a> - strip reading reflective colorimeter.<br> DTP92 - CRT display colorimeter.<br> DTP94 <font size="-1">"Optix XR"</font> or "Optix XR2" - display colorimeter.<br> <br> Gretag-Macbeth:<br> Spectrolino - spot reflective/emissive spectrometer<br> SpectroScan - spot reflective/emissive, XY table reflective spectrometer <br> SpectroScanT - spot reflective/emissive/transmissive, XY table reflective spectrometer<br> <a href="#i1p">Eye-One Pro</a> - spot and "swipe" reflective/emissive spectrometer<br> Eye-One Display 1 or 2 or LT - display colorimeter<br> Huey - display colorimeter<br> <br> Sequel imaging:<br> MonacoOPTIX - display colorimeter (Treated as an Eye-One Display 1)<br> [The Sequel Chroma 4 may also work.]<br> <br> ColorVision:<br> <a href="#spyd2">Spyder 2</a> - display colorimeter (Note that the user must <a href="spyd2en.html">supply</a> firmware)<br> [The Spyder 1 also seems to work.]<br> <br> Other:<br> <span class="titre"><a href="#HCFR">Colorimètre HCFR</a> - display colorimeter<br> <br> General information about:<br> <br> <a href="#strip">Strip reading instruments</a><br> </span> <a href="#xy">X-Y Table instruments</a><br> <span style="font-weight: bold;"></span><br> <br> <hr style="width: 100%; height: 2px;"> <h3><a name="strip"></a>Strip reading instruments</h3> When used with a <span style="font-weight: bold;">DT20</span>, <span style="font-weight: bold;">DTP41</span>, <span style="font-weight: bold;">DTP51</span> or <span style="font-weight: bold;">Eye-One Pro</span> strip reading instrument, chartread will first establish communications with the instrument, and then set it up ready to read the strips. The strips are labeled A to ZZ, and for each strip it will prompt:<br> <br> About to read strip XX :<br> <br> where XX is the strip label. For the DTP51 you should feed the strip into the instrument, and the microswitch will trigger the read. For the DTP41 you should line the appropriate strip up in the machine, and press its button. For the Eye-One Pro you should set the guide to the appropropriate strip, place the instrument ahead of the first patch, and then press and hold the instruments button. When you hear a beep from the computer, you can then move the instrument steadily over the patches, releasing the button after the instrument is past the last patch. Moving the instrument too fast or changing speeds may cause a mis-read, or a scan with few samples read per patch. Using the Eye-One Pro the strip may be scanned from either direction.<br> <br> Note that you may have to check that system alert sounds are enabled and at a suitable volume to in order to hear the beep prompt. For the Eye-One Pro, a second beep will sound after a successfully read strip, or a double beep will sound, indicating a failure or warning that needs attention. See also the note on Linux in <a href="Installing.html">installation</a>.<br> <br> If the strip is read successfully, the line will be completed with:<br> <br> About to read strip XX : Strip read OK<br> <br> If there is an error of some sort, a message will be issued, and you will be asked whether to abort the chart reading, or retry the<br> failed strip:<br> <br> About to read strip X : read_strip returned 'Strip misread' (Bad reading)<br> <br> Strip read failed due to misread<br> Hit Esc to give up, any other key to retry:<br> <br> If the strip is read successfully, but the patches values don't seem to be what is expected, you will get the following type of warning:<br> <br> About to read strip XX :<br> (Warning) Seem to have read strip YY rather than XX !<br> Hit Return to use it anyway, any other key to retry, Esc, ^C or Q to give up:<br> <br> This could be because you have accidentally read the wrong strip (a common mistake), or it could be that the device response is so different from what is expected that warning is erroneous, or you may get a lot of these sorts of warnings if you are accidentally reading the wrong chart. <br> If you are sure you lined up the correct strip, then hit return, otherwise line the appropriate strip up again, and hit some other key (ie. space).<br> Erroneous warnings are less likely if a previous profile for a device was given to targen to set more accurate expectations.<br> <br> You may also see the following type of warning:<br> <br> About to read strip XX :<br> (Warning) Patch error YY.YYY (>35 not good, >95 bad)<br> There is at least one patch with an very unexpected response!<br> Hit Return to use it anyway, any other key to retry, Esc, ^C or Q to give up:<br> <br> Similar to the previous warning, this indicates that while the right strip appears to have been read, one of the patch readings is quite different to what is expected. This may indicate an error of some sort (ie. damaged test chart, or bad instrument positioning), or may be erroneous if the actual device response is quite different to the expectation.<br> Erroneous warnings are less likely if a previous profile for a device was given to targen to set more accurate expectations.<br> <br> You can abort the whole process at any time by hitting Escape.<br> <br> <hr style="width: 100%; height: 2px;"> <h3><a name="xy"></a>X-Y Table instruments</h3> When you are using an XY table type instrument, such as a Gretag <span style="font-weight: bold;">SpectroScan</span>, chartread will first establish communications with the instrument, and then set it up ready to read the chart. You will be prompted for each sheet with a message such as:<br> <br> Please make sure that the white reference is in slot 1, then<br> place sheet 1 of 4 on table, then<br> hit return to continue, Esc to give up<br> <br> After hitting return you will be prompted to line up three squares on the sheet, one at a time:<br> <br> Using the XY table controls, locate patch A1 with the sight,<br> then hit return to continue, Esc to give up<br> <br> On completing this, the instrument will commence reading each sheet.<br> <br> <hr style="width: 100%; height: 2px;"><a name="dtp51"></a><span style="font-weight: bold;">DTP51<br> <span style="font-weight: bold;"><br> </span></span>The DTP51's switch is triggered by inserting a strip into the slot.<br> <br> <span style="font-weight: bold;"><span style="font-weight: bold;"></span></span> <hr style="width: 100%; height: 2px;"><span style="font-weight: bold;"><br> <a name="dtp20"></a>DTP20</span><br> <br> The <span style="font-weight: bold;">DTP20</span> has a couple of unique features that Argyll can take advantage of. One is that it can operate un-tethered (off line). A whole chart can be read un-tethered by first clearing any previous readings in the instrument, then reading the chart TID strip, before reading all the other strips. The instrument can then be connected up to <span style="font-weight: bold;">chartread</span>, which will recognize the chart, and download all the measurements.<br> If there is no chart in the instrument when chartread connects to it, then it will use the strip by strip tethered mode, just like the other strip instruments. If the right number of spot readings are present in the instrument, these will be used by <span style="font-weight: bold;">chartread</span> too.<br> <br> Un-tethered spot measurements can also be read in using <span style="font-weight: bold;">spotread</span>, which will notice the stored readings, and offer to print them out, or they can be ignored, and tethered readings taken. This will clear any saved spot readings.<br> <br> <span style="font-weight: bold;">Note</span> that tethered (on-line) strip reading will only work if the firmware in the device is version 1.03 or greater. You can check the firmware version by running with the verbose option: <span style="font-weight: bold;">-v<br> </span><span style="font-weight: bold;"><br> </span><br> <hr style="width: 100%; height: 2px;"><br> <span style="font-weight: bold;"><a name="i1p"></a>Eye-One Pro<br> <br> Patch recognition:</span><br> <br> For the best chances of good patch recognition, the instrument should be drawn smoothly and not too rapidly over the strip. If there is a misread, try slowing down slightly. The Rev A. instrument has a slower sampling rate than the latter revision instruments, and hence must be used a bit more slowly. Generally a higher quality set of readings will result if slower scans are used, since there wil then be more samples averaged for each patch.<br> <br> In <a href="chartread.html">chartread</a>, the -<span style="font-weight: bold;">T ratio</span> argument modifies the patch consistency tolerance threshold for the Eye-One Pro. In recognizing patches in a strip, the instrument takes multiple readings as the strip is read, and then divide the readings up into each patch. It then check the consistency of the multiple readings corresponding to each patch, and reject the measurement if they are too inconsistent. For some media (ie. a coarser screens, fabric etc.) the default tolerance may be unreasonably tight, so the <span style="font-weight: bold;">-T ratio</span> argument can be used to modify this criteria. To loosen the tolerance, use a number greater than 1.0 (ie. 1.5, 2.0). <br> <br> <span style="font-weight: bold;">Special features:</span><br> <br> A feature unique to Argyll when used with the Eye-One Pro, is the high resolution spectral mode. This returns spectral measurements at 3.333 nm spacing, rather than the default 10nm spacing, and also extends the range of wavelengths slightly. This high resolution may assist in giving better accuracy for "peaky" emissive sources such as illuminants and displays. The high resolution mode is selected by using the <span style="font-weight: bold;">-H</span> flag on the command line to <span style="font-weight: bold;">dispcal</span>, <span style="font-weight: bold;">dispread</span>, <span style="font-weight: bold;">chartread</span>, and <span style="font-weight: bold;">spotread</span>. It can also be toggled on and off within <span style="font-weight: bold;">spotread</span> using the <span style="font-weight: bold;">h</span> key. The extended range down to 350nm may give some information about an illuminants ultra violet content, although the accuracy of the readings between 350-380, and 730-750nm should not be relied upon.<br> <br> <img alt="High res. and standard res. spectrum." src="Fluorescent.jpg" style="width: 750px; height: 375px;"><br> <br> <img alt="C.R.T high res. and standard res. spectrum." src="CRTspectrum.jpg" style="width: 750px; height: 375px;"><br> <br> <br> <hr style="width: 100%; height: 2px;"><a name="HCFR"></a><span style="font-weight: bold;" class="titre">Colorimètre HCFR</span><br> <span style="font-weight: bold;"><span style="font-weight: bold;"></span></span><br> The accuracy of this instrument does not seem to be comparable to the commercial instruments when used for measuring displays, particularly in the area of measuring dark colors, and I've seen the best results when used with a CRT display. It may well give good results in calibrating projectors, since this was what it was designed to do.<br> <br> <hr style="width: 100%; height: 2px;"><br> <span style="font-weight: bold;"><a name="spyd2"></a>Spyder 2 Colorimeter<br> <br> Important Note </span>about the ColorVision Spyder 2 instrument support:<br> <br> This instrument cannot function without the driver software having access to the vendor supplied PLD firmware pattern for it.<br> This firmware is not provided with Argyll, since it is not available under a compatible license.<br> <br> The purchaser of a Spyder 2 instrument should have received a copy of this firmware along with their instrument, and should therefore be able to enable the Argyll driver for this instrument by using the <a href="spyd2en.html">spyd2en</a> utility.<br> <span style="font-weight: bold;"><br> </span><br> <br> </body> </html>