164 lines
6.7 KiB
HTML
Executable File
164 lines
6.7 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>invprofcheck</title>
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<meta http-equiv="content-type" content="text/html;
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charset=windows-1252">
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<meta name="author" content="Graeme Gill">
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</head>
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<body>
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<h2><b>profile/invprofcheck</b></h2>
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<h3>Summary</h3>
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Check <a href="File_Formats.html#ICC">ICC</a> forward against
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reverse lookup. <br>
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<h3>Usage Summary</h3>
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<tt>usage: invprofcheck [-options] <i>profile.icm</i></tt><tt><br>
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</tt><tt> -v [level]
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Verbosity level (default 1), 2 to print each DE</tt><tt><br>
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</tt><tt> -l
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limit Set total
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ink limit (estimate by default)</tt><tt><br>
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</tt><tt> -L
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klimit Set black channel ink
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limit (estimate by default)</tt><tt><br>
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</tt><tt>
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-h
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High res test (27)</tt><tt><br>
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</tt><tt>
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-u
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Ultra
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high res test (61)</tt><tt><br>
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</tt><tt> -R
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res
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Specific grid resolution</tt><tt><br>
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</tt><tt>
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-I
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Do bwd to fwd check</tt><tt><br>
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</tt><tt>
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-c
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Show
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CIE94 delta E values</tt><tt><br>
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</tt><tt>
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-k
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Show
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CIEDE2000 delta E values</tt><tt><br>
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</tt><tt>
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-w
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Create
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X3DOM visualisation (profile.x3d.html)</tt><tt><br>
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</tt><tt>
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-x
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Use
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X3DOM axes</tt><tt><br>
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</tt><tt>
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-e
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Color
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vectors acording to delta E</tt><tt><br>
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</tt><tt> </tt><tt><a moz-do-not-send="true" href="#Yc">-Y
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c:file.cal</a></tt><tt> Provide or overide
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calibration total ink curves </tt><br>
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<tt><i>profile.icm</i> Profile to check </tt><br>
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<h3>Usage Details and Discussion</h3>
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<b>invprofcheck</b> provides a way of checking how well an <a
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href="File_Formats.html#ICC">ICC</a> profile inverse transform
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inverts the forward transform. For devices with more than 4
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channels, a total ink limit is assumed, and (if no <span
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style="font-weight: bold;">-l</span> parameter is given) a
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reasonable number is deduced from the reverse table. A grid of
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device values is created, and the transform from PCS->device, and
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then device->PCS is computed in L*a*b* space. The average,
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maximum and RMS error delta E values are computed and displayed in
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the chosen delta E metric. A <a href="File_Formats.html#X3DOM">X3DOM</a>
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plot of the error vectors can be created. <span style="font-weight:
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bold;">invprofcheck</span> tries to only test in-gamut color
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values. Note that because it scans a device grid, for a CMYK device,
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the density of test points will be progressively higher in the dark
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regions, and the average and RMS values will be distorted by the
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denser sampling.<br>
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<br>
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The <b>-v</b> flag prints out extra information during the
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checking. A value greater than 1 will print the color values of each
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test point.<br>
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<br>
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The <b>-l</b> flag allows setting a total ink limit (TAC) for
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printing devices. If a device has a total ink limit, and hasn't been
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characterised with device values above this limit, then plotting the
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gamut in these areas will almost certainly be misleading. The ink
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limit will be in final raw device values if the profile includes
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calibration information.<br>
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<br>
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The <b>-L</b> flag allows setting a black channel ink limit for
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printing devices. If a device has a black ink limit, and hasn't been
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characterised with device values above this limit, then plotting the
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gamut in these areas will almost certainly be misleading. The black
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ink limit will be final raw device values if the profile includes
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calibration information.<br>
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<br>
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The default device grid is relativy low, and 11 (ie. 11 x 11 x 11
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for an RGB device, 11 x 11 x 11 x 11 for a CMYK device etc.).<br>
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<br>
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The <span style="font-weight: bold;">-h</span> flag selects a
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higher device grid resolution of 27.<br>
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<br>
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The <span style="font-weight: bold;">-u</span> flag selects an
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extremely high device grid resolution of 61. This will probably take
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a long time to run.<br>
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<br>
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The <span style="font-weight: bold;">-G res</span> option allows a
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specific grid resolution to be used.<br>
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<br>
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If the <b>-I</b> option is used, then the grid is in L*a*b* space,
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so out of gamut clipping behavior can be examined. Delta E's will be
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high due to the clipping.<br>
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<br>
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The <b>-c</b> option causes the error differences to be displayed
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in CIE94 delta E, rather than plain L*a*b* delta E. CIE94 delta E
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has a closer correspondence with perceived color differences than
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the default CIE76 delta E values.<br>
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<br>
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The <b>-k</b> option causes the error differences to be displayed
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in CIEDE2000 delta E, rather than plain L*a*b* delta E. CIEDE2000
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delta E has a closer correspondence with perceived color differences
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than either CIE76 or CIE94 delta E values.<br>
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<br>
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The <b>-w</b> creates a <a href="File_Formats.html#X3DOM">X3DOM</a>
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3D visualization of the differences between the test points and the
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profiles prediction of the resulting colors.<br>
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<br>
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The <b>-x</b> flag adds Lab axes to the X3DOM output.<br>
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<br>
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The <span style="font-weight: bold;">-e</span> flag causes the
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error vectors in the X3DOM output to be color coded according to
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their lengths, from longest to shortest: yellow, red, magenta, blue,
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cyan and green.<br>
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<br>
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<a name="Yc"></a>The <span style="font-weight: bold;">-Y c:</span><span
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style="font-style: italic;">file.cal</span> parameter adds
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or overrides Calibration curves that will be used in the computation
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of the total or black ink limit calculation. This allows the ink
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limits to be computed in final raw device units.<br>
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<br>
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<br>
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<br>
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</body>
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</html>
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