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diff --git a/doc/invprofcheck.html b/doc/invprofcheck.html new file mode 100644 index 0000000..9851774 --- /dev/null +++ b/doc/invprofcheck.html @@ -0,0 +1,133 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html> +<head> + <title>invprofcheck</title> + <meta http-equiv="content-type" + content="text/html; charset=ISO-8859-1"> + <meta name="author" content="Graeme Gill"> +</head> +<body> +<h2><b>profile/invprofcheck</b></h2> +<h3>Summary</h3> +Check <a href="File_Formats.html#ICC">ICC</a> forward against reverse +lookup. +<br> +<h3>Usage Summary</h3> +<small><span style="font-family: monospace;">usage: invprofcheck +[-options] </span><span + style="font-style: italic; font-family: monospace;">profile.icm</span><br + style="font-family: monospace;"> +<span style="font-family: monospace;"> -v [level] +verbosity level (default 1), 2 to print each DE</span><br + style="font-family: monospace;"> +<span style="font-family: monospace;"> -l +limit set total ink +limit (estimate by default)<br> +</span></small><small><span style="font-family: monospace;"> -L +klimit set black channel ink +limit (estimate by default)</span></small><br + style="font-family: monospace;"> +<small><span style="font-family: monospace;"></span><span + style="font-family: monospace;"> -h +high res test (27)</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -u +Ultra high res test (61)<br> + -R res Specific grid +resolution<br style="font-family: monospace;"> +</span><span style="font-family: monospace;"> -c +Show CIE94 delta E values</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -k +Show CIEDE2000 delta E values</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -w +create VRML visualisation (profile.wrl)</span><br + style="font-family: monospace;"> +<span style="font-family: monospace;"> -x +Use VRML axes</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -e +Color vectors acording to delta E</span><br + style="font-family: monospace;"> +<span style="font-style: italic; font-family: monospace;"> profile.icm</span><span + style="font-family: monospace;"> +Profile to check</span></small> +<br> +<h3>Usage Details and Discussion</h3> +<b>invprofcheck</b> provides a way of checking how well an <a + href="File_Formats.html#ICC">ICC</a> profile inverse transform inverts +the forward transform. For devices with more than 4 channels, a total +ink limit is assumed, and (if no <span style="font-weight: bold;">-l</span> +parameter is given) a reasonable number is deduced from the reverse +table. A grid of device values is created, and the transform from +PCS->device, and then device->PCS is computed in L*a*b* space. +The average, maximum and RMS error delta E values are computed and +displayed in the chosen delta E metric. A <a + href="File_Formats.html#VRML">VRML</a> plot of the error vectors can +be created. <span style="font-weight: bold;">invprofcheck</span> tries +to only test in-gamut color values. Note that because it scans a device +grid, for a CMYK device, the density of test points will be +progressively higher in the dark regions, and the average and RMS +values will be distorted by the denser sampling.<br> +<br> +The <b>-v</b> flag prints out extra information during the checking. A +value greater than 1 will print the color values of each test point.<br> +<br> +The <b>-l</b> flag allows setting a total ink limit (TAC) for printing +devices. If a device has a total ink limit, and hasn't been +characterised with device values above this limit, then plotting the +gamut in these areas will almost certainly be misleading. The ink limit +will be in final calibrated device values if the profile includes +calibration information.<br> +<br> +The <b>-L</b> flag allows setting a black channel ink limit for +printing +devices. If a device has a black ink limit, and hasn't been +characterised with device values above this limit, then plotting the +gamut in these areas will almost certainly be misleading. The black ink +limit +will be final calibrated device values if the profile +includes calibration information.<br> +<br> +The default device grid is relativy low, and 11 (ie. 11 x 11 x 11 for +an RGB device, 11 x 11 x 11 x 11 for a CMYK device etc.).<br> +<br> +The <span style="font-weight: bold;">-h</span> flag selects a higher +device grid resolution of 27.<br> +<br> +The <span style="font-weight: bold;">-u</span> flag selects an +extremely high device grid resolution of 61. This will probably take a +long time to run.<br> +<br> +The <span style="font-weight: bold;">-G res</span> option allows a +specific grid resolution to be used.<br> +<br> +The <b>-c</b> option causes the error differences to be +displayed +in CIE94 delta E, rather than plain L*a*b* delta E. CIE94 delta E has a +closer +correspondence with perceived color differences than the default CIE76 +delta E values.<br> +<br> +The <b>-k</b> option causes the error differences to be +displayed +in CIEDE2000 delta E, rather than plain L*a*b* delta E. CIEDE2000 delta +E has a +closer +correspondence with perceived color differences than either CIE76 or +CIE94 delta E values.<br> +<br> +The <b>-w</b> creates a <a href="File_Formats.html#VRML">VRML</a> 3D +visualization +of the differences between the test points and the profiles prediction +of +the resulting colors.<br> +<br> +The <b>-x</b> flag adds Lab axes to the VRML output.<br> +<br> +The <span style="font-weight: bold;">-e</span> flag causes the error +vectors in the VRML output to be color coded according to their +lengths, from longest to shortest: yellow, red, magenta, blue, cyan and +green.<br> +<br> +<br> +<br> +</body> +</html> |