profcheck

From 22f703cab05b7cd368f4de9e03991b7664dc5022 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 1 Sep 2014 13:56:46 +0200 Subject: Initial import of argyll version 1.5.1-8 --- doc/profcheck.html | 251 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 251 insertions(+) create mode 100644 doc/profcheck.html (limited to 'doc/profcheck.html') diff --git a/doc/profcheck.html b/doc/profcheck.html new file mode 100644 index 0000000..ebb719b --- /dev/null +++ b/doc/profcheck.html @@ -0,0 +1,251 @@ + + + + profcheck + + + + +

profile/profcheck

Summary

+ Check an ICC profile + against .ti3 test chart + data.
+

Usage Summary

+ profcheck + [-options] + data.ti3 iccprofile.icm
+ + -v + [level]      + Verbosity level (default 1), 2 to print each DE
+ -c           +   +Show + CIE94 delta E values
+ -k +           +    Show CIEDE2000 delta E values
+ -w           +   +create + VRML visualization (iccprofile.wrl)
+ -x           +   +Use + VRML axes
+ -m              +Make +VRML + lines a minimum of 0.5
+ -e              +Color +vectors + acording to delta E
+ -d + devval1,deval2,devvalN
+               +   +Specify + a device value to sort + against
+ -p           +   +Sort + device value by PCS/Lab target
+ + -f + [illum]      Use Fluorescent Whitening + Agent compensation [opt. simulated inst. illum.:
+                   + M0, M1, M2, A, C, D50 (def.), D50M2, D65, F5, F8, F10 or + file.sp]
+ -i illum        Choose + illuminant for computation of CIE XYZ from spectral data & + FWA:
+                  + A, C, D50 (def.), D50M2, D65, F5, F8, F10 or file.sp
+ -o + observ    +    Choose CIE + Observer + for spectral data:
+                    + 1931_2 + (def.), + 1964_10, S&B + 1955_2, shaw, J&V 1978_2
+ -I intent       r = relative + colorimetric, a = absolute (default)
+ data.ti3     +    + Test + point data file
+ iccprofile.icm Profile to check +
+

Usage Details and Discussion

+ profcheck provides a way of checking how well an ICC profile conforms to the test + sample data that was used to create it (or other test samples + that are from the same device). This is the same sort of check done + within + the profile making tool (colprof), but + having a + separate tool provides some flexibility. The absolute forward + table in the profile is used to create PCS values from the sample + points, and the profiles PCS value then compared to the PCS values + of + the measured sample points. Note the lower delta E values are not + always a better measure of how good a profile is. The aim of a + profile + is to model the underlying characteristics of a device, not to + slavishly reproduce the sampled data point values. Sampled data + point + values contain device variation and instrument reading inaccuracies, + and a good profiler will try and filter out this noise, resulting in + some deliberate differences between the profile and the sample + points + used to create it.
+
+ The -v flag prints out extra information during the + checking. A + value greater than 1 will print the color values of each test point.
+
+ The -c option causes the differences between the test values + and + the profile prediction of the color for each device value 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.
+
+ The -k option causes the differences between the test values + and + the profile prediction of the color for each device value 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.
+
+ The -w creates a VRML + 3D + visualization + of the differences between the test points and the profiles + prediction + of + the resulting colors.
+
+ The -x flag adds Lab axes to the VRML output.
+
+ The -m flag makes each error line a minimum of 0.5 delta E + long, so that all the points are visible. This makes it easier to + view + the distribution of test points in the reference set.
+
+ The -e 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.
+
+ The -d parameters allow the specification of a particular + device value, + and the test point by test point output will be sorted by distance + from + the + given device value. This can be useful in determining how well + "supported" + the profile is in a particular area of the colorspace.
+
+ If the -p flag is used in combination with the -d + parameters, + then the test point by test point output will be sorted by distance + in + PCS + (Lab) space rather than distance in device space.
+
+ The -f flag enables Fluorescent Whitening Agent (FWA) + compensation. This only works if spectral data is available and, the + instrument is not UV filtered. FWA compensation adjusts the + spectral samples so that they appear to have been measured using an + illuminant that has a different level of Ultra Violet to the one the + instrument actually used in the measurement. The optional + illumination parameter allows specifying a standard or custom + illumination spectrum to be used as the similated instrument + illuminant, overriding the default D50 or CIE computation + illuminant used for FWA (see -i below). See colprof -f for + a fuller explanation. The same value should be used as was used + during the creation of the + profile.
+
+ The -i flag allows specifying a standard or custom + illumination + spectrum, applied to the spectral test point values to compute CIE + tristimulus values. A, D50, D50M2, D65, F5, + F8, F10 are a selection of standard illuminant + spectrums, with D50 being the default. If a filename is + specified instead, it will be assumed to be an Argyll specific .sp + spectrum file. If FWA compensation is used during measurement, this + illuminant will be used by default as the simulated instrument + illuminant. The same value should be used as was used during the + creation of the + profile.
+
+ The -o flag allows specifying a tristimulus + observer, and is used to compute PCS (Profile Connection Space) + tristimulus values. The following choices are available:
+ 1931_2 selects the standard CIE 1931 2 degree + observer. + The default.
+ 1964_10 selects the standard CIE 1964 10 degree + observer.
+ 1955_2 selects the Stiles and Birch 1955 2 degree + observer
+ 1978_2 selects the Judd and Voss 1978 2 degree + observer
+ shaw selects the Shaw and Fairchild 1997 2 degree + observer
+
+ The same parameter value should be used as was used during the + creation + of the profile.
+
+ The -I parameter allows + changing the intent used in looking up the ICC profile colors to + relative colorimetric. This would not be used if you are + checking a profile against the .ti3 file that was used to create it, + since, since profiles are always made + from absolute colorimetric measurement values.
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+ + -- cgit v1.2.3