<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>dispwin</title> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <meta name="author" content="Graeme Gill"> </head> <body> <h2><b>spectro/dispwin</b></h2> <h3>Summary</h3> This utility has a couple of different functions. When given as a file argument an ICC profile containing vcgt "gamma" curves, or an Argyll video calibration .cal file, it will load that calibration into the chosen display. By default it displays a test window the same as that used by dispcal and dispread, to test this functionality. It can also be used to test the ability to load video card LUT curves to each display, and to test how the console Bell will sound when used with some instruments (ie. Eye-One Pro).<br> <h3>Usage</h3> <font size="-1"><span style="font-family: monospace;">dispwin [options] [<span style="font-style: italic;">calfile</span>]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#v">-v</a><span style="font-family: monospace;"> Verbose mode<br> </span></font><font size="-1"><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#display">-display displayname</a><span style="font-family: monospace;"> [X11 only] Choose X11 display name<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="#dnm">-d n[,m]</a> [X11 only] Choose the display from the following list (default 1),<br> and optionally choose a different display m for Video LUT access.<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="#d">-d n</a> [Not X11] Choose the display from the following list (default 1)<br style="font-family: monospace;"> </span></font><font size="-1"><span style="font-family: monospace;"></span><span style="font-family: monospace;"> <a href="#p">-p ho,vo,ss</a> Position test window and scale it</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> ho,vi: 0.0 = left/top, 0.5 = center, 1.0 = right/bottom etc.</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> ss: 0.5 = half, 1.0 = normal, 2.0 = double etc.<br> </span></font><font size="-1"><span style="font-family: monospace;"><a href="#B">-B</a> Fill whole screen with black background</span></font><br style="font-family: monospace;"> <font size="-1"><span style="font-family: monospace;"></span><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#i">-i</a><span style="font-family: monospace;"> Run forever with random values<br> </span></font><font size="-1"><a style="font-family: monospace;" href="#m">-m</a><span style="font-family: monospace;"> Manually step through colors</span></font><br> <font size="-1"><span style="font-family: monospace;"> <a href="#r">-r</a> Test just video LUT loading<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="#n">-n</a> Test native display values (rather than through Video LUT)</span></font><br> <font size="-1"><span style="font-family: monospace;"> <a href="dispwin.html#c">-c</a> Load a linear display calibration (clear calibration)<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="dispwin.html#x">-x</a> Don't exit after loading a calibration.<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="#V">-V</a> Verify that calfile is currently loaded<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="dispwin.html#S">-S</a> </span></font><font size="-1"><span style="font-family: monospace;">[X11 only] </span></font><font size="-1"><span style="font-family: monospace;">Set X11 ICC_PROFILE atom to profile<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="dispwin.html#L">-L</a> </span></font><font size="-1"><span style="font-family: monospace;">[X11 only] </span></font><font size="-1"><span style="font-family: monospace;">Load X11 ICC_PROFILE property profile into LUT</span></font><font size="-1"><span style="font-family: monospace;"></span><span style="font-family: monospace;"><br> </span></font><a style="font-family: monospace;" href="#p1"><font size="-1"><span style="font-family: monospace;"></span></font></a><font size="-1"><a style="font-family: monospace;" href="#p1"><i>calfile</i></a><span style="font-family: monospace;"> Load display calibration (<a href="cal_format.html">.cal</a> or .icm) into LUT, and exit.</span><span style="font-family: monospace;"></span><span style="font-family: monospace;"></span></font><br> <br> <h3>Comments<br> </h3> <a name="v"></a> The <b>-v</b> flag makes the program more verbose..<br> <br> <a name="display"></a>When running on a UNIX based system that used the X11 Windowing System, <b>dispwin</b> will by default use the $DISPLAY environment variable to determine which display and screen to read from. This can be overridden by supplying an X11 display name to the <span style="font-weight: bold;">-display</span> option. Note that if Xinerama is active, you can't select the screen using $DISPLAY or -display, you have to select it using the <span style="font-weight: bold;">-d</span> parameter.<br> <br> <a name="d"></a> By default the location of the test window will be the main display. If the system has more than one display or screen, an alternate display/screen can be selected with the <span style="font-weight: bold;">-d</span> parameter. If you invoke <span style="font-weight: bold;">dispwin</span> so as to display the usage information (i.e. "dispcal -?" or "dispcal --"), then the discovered displays/screens will be listed. Multiple displays may not be listed if they appear as a single display to the operating system (ie. the multi-display support is hidden in the video card driver). On UNIX based system that used the X11 Windowing System, the <span style="font-weight: bold;">-d</span> parameter will override the screen specified by the $DISPLAY or <span style="font-weight: bold;">-display</span> parameter.<br> <br> <span style="font-weight: bold;">Note</span> that if <span style="font-weight: bold;"></span> the VideoLUTs for a display are not accessible, <span style="font-weight: bold;">dispwin</span> will fail when it attempts to access them. This could be because you are trying to access a remote display, and the remote display doesn't support the XF86VidMode extension, or perhaps you are running multiple monitors using NVidia TwinView, or MergedFB, and trying to access anything other than the primary monitor. TwinView and MergedFB don't properly support the XF86VidMode extension for multiple displays. Xinerama does properly support calibration of multiple displays. See also below, on how to select a different display for VideoLUT access. Also note that dispwin will fail if the Visual depth doesn't match the VideoLUT depth. Typically the VideoLUTs have 256 entries per color component, so the Visual generally needs to be 24 bits, 8 bits per color component.<br> <br> <a name="dnm"></a>Because of the difficulty cause by TwinView and MergedFB in X11 based systems, you can optionally specify a separate display number after the display that is going to be used to present test patches, for accessing the VideoLUT hardware. This must be specified as a single string, e.g. <span style="font-weight: bold;">-d 1,2</span> . Some experimentation may be needed on such systems, to discover what screen has access to the VideoLUT hardware, and which screens the test patches appear on. You may be able to calibrate one screen, and then share the calibration with another screen. Profiling can be done independently to calibration.<br> <br> <a name="p"></a> The <span style="font-weight: bold;">-p</span> parameter allows you to position and size the test patch window. By default it is places in the center of the screen, and sized appropriately for the type of instrument. The <span style="font-weight: bold;">ho</span> and <span style="font-weight: bold;">vo</span> values govern the horizontal and vertical offset respectively. A value of 0.0 positions the window to the far left or top of the screen, a value of 0.5 positions it in the center of the screen (the default), and 1.0 positions it to the far right or bottom of the screen. The <span style="font-weight: bold;">ss</span> parameter is a scale factor for the test window size. A value of 0.5 for instance, would produce a half sized window. A value of 2.0 will produce a double size window. Note that the ho,vo,ss numbers must be specified as a single string (no space between the numbers and the comma).<br> For example, to create a double sized test window at the top right of the screen, use <span style="font-weight: bold;">-p 1,0,2</span> .<br> <br> <a name="B"></a> The <span style="font-weight: bold;">-B</span> flag causes the while screen behind the test window to be masked with black. This can aid black accuracy when measuring CRT displays or projectors.<br> <br> By default <span style="font-weight: bold;">dispwin</span> will put a test window on the selected display, and display some test colors, before darkening then brightening the screen by loading video LUT values, test the bell sounds, then restore the original values and exit.<br> <br> If the <a name="i"></a><span style="font-weight: bold;">-i</span> flag is set, then <span style="font-weight: bold;">dispwin</span> will display the preset sequence, then random test colors forever.<br> <br> If the <a name="m"></a><span style="font-weight: bold;">-m</span> flag is set, then <span style="font-weight: bold;">dispwin</span> will display the preset sequence then exits, but advances manually after each return key.<br> <br> If the <a name="r"></a><span style="font-weight: bold;">-r</span> flag is set, then <span style="font-weight: bold;">dispwin</span> will test just the loading of video LUT values by first darkening, then lightening the screen, before exiting.<br> <br> If the <a name="n"></a><span style="font-weight: bold;">-n</span> flag is set, then <span style="font-weight: bold;">dispwin</span> will display the colors directly on the display, rather than having the color values translated through the currently loaded Video LUTs.<br> <br> <a name="c"></a> If a <span style="font-weight: bold;">-c</span> flag is used, then rather than displaying a test window, <span style="font-weight: bold;">dispwin</span> will load the selected display with a linear set of Video LUT curves, effectively clearing the calibration, and will then exit. Any <span style="font-style: italic;">calfile</span> will be ignored.<br> <br> <a name="x"></a> If a <span style="font-weight: bold;">-x</span> flag is used, then after clearing (-c flag) or loading a calibration from a .cal or ICC profile, dispwin will continue running forever, rather than exiting. This is useful on Apple OS X, which reverts the video LUT contents when an application like dispwin exits. The only way on OS X to permanently load a calibration is to incorporate it in an ICC profile, and make it the profile for the display in <span style="font-style: italic;">System-Preferences->Displays</span>.<br> <br> <a name="V"></a> If a <span style="font-weight: bold;">-V</span> flag is used, then rather than loading the calibration specified as the final argument, the currently loaded calibration will be verified as being the same as the given calibration file.<br> <br> <a name="S"></a> <span style="font-weight: bold;"></span>When running on a UNIX X11 Windowing System, if an <span style="font-weight: bold;">-S</span> flag is used then the ICC profile specified as the final argument will be installed into the appropriate X11 _ICC_PROFILE property in the root window. This follows this <a href="http://www.burtonini.com/computing/x-icc-profiles-spec-0.2.html">convention</a> for allowing applications to locate the display profile for a particular X11 display. Calibration in the profile is not loaded onto the display.<br> <br> <a name="L"></a> <span style="font-weight: bold;"></span>When running on a UNIX X11 Windowing System, if an <span style="font-weight: bold;">-L</span> flag is used then the display video LUT is set from the <span style="font-weight: bold;">vcgt</span> tag in the profile stored in the appropriate X11 _ICC_PROFILE property in the root window. This follows this <a href="http://www.burtonini.com/computing/x-icc-profiles-spec-0.2.html">convention</a> for allowing applications to locate the display profile for a particular X11 display. The <span style="font-weight: bold;">-L</span> flag can be used with the <span style="font-weight: bold;">-V</span> flag to verify that the current calibration is that from the _ICC_PROFILE property.<br> <br> <a name="p1"></a> The final optional parameter on the command line is the name of an ICC profile that contains a Video LUT <span style="font-weight: bold;">vcgt</span> tag, or an Argyll <a href="cal_format.html">.cal</a> format display calibration. If this parameter is provided, then the selected display will be loaded with the given calibration. If the <span style="font-weight: bold;">-V</span> flag was given, then it is verified that this calibration is the currently loaded one. This is useful in initializing a system to the current calibration on system startup. Note that the vcgt tag interpretation within Argyll is consistent with that of the originators of the tag. Other ICC profile vcgt implementations may not be so consistent.<br> <br> <br> <br> <br> </body> </html>
