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/fakeread.html | 248 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 248 insertions(+) create mode 100644 doc/fakeread.html (limited to 'doc/fakeread.html') diff --git a/doc/fakeread.html b/doc/fakeread.html new file mode 100644 index 0000000..aa2847c --- /dev/null +++ b/doc/fakeread.html @@ -0,0 +1,248 @@ + + + + fakeread + + + + +

spectro/fakeread

+

Summary

+Simulate the measurement of a devices response, using an existing +device profile, or measured test point data set. The device profile can +be either +an ICC or MPP profile, or the data set can be a +.ti3 file. A device link +separation or color space conversion can be applied before the +print/measure simulation.
+

Usage

+fakeread [-v] [-s] [separation.icm] profile.[icm|mpp|ti3] inoutfile
+ -v                +  +      Verbose mode
+ -s                +  +      Lookup MPP spectral values
+ -p                        +Use +separation profile
+ -l                        +Output +Lab rather than XYZ
+ -k +file.cal               +Apply +calibration (after sep.) and include in .ti3
+ -i +file.cal               +Include +calibration in .ti3 (but don't apply it)
+ -r +level                  +Add +average random deviation of <level>% to input device values +(after sep. & cal.)
+ -0 +pow                    +Apply +power to input device chanel 0-9 (after sep. cal. & rand.)
+  +-R +level                  +Add +average random deviation of <level>% to output PCS values
+ -u +      +                 +Make +random deviations have uniform distributions rather than normal
+ -S +seed                   +Set +random seed
+ -b +L,a,b                  +Scale +black point to target Lab value
+ -I +intent                 +r = relative colorimetric, a = absolute (default)
+ [separation.icm]          +Device +link separation profile
+ profile.[icm|mpp|ti3]     ICC, MPP +or .ti3 +profile/file to use
+  +inoutfile           +  +    Base name for +input[.ti1]/output[.ti3] file
+
+Examples
+
+fakeread profile.icm testvalues
+fakeread -p separation.icm profile.icm testvalues
+

Comments
+

+The -v flag does nothing at +the moment.
+The -s flag works only with +MPP profiles that contain spectral model +information.
+The -p flag enables a device +to device value conversion before +converting to expected PCS values.
+The -l flag causes the CIE +output values to be L*a*b* rather than the +default XYZ values.
+
+The -k file.cal parameter specifies a printer +calibration file created by printcal, and +the supplied calibration curves will be applied to the chart device +values after any separation. This allows emulating a system that uses +per device channel calibration. The calibration curves will also be +included in +the resulting .ti3 file, so that they can be passed through to the ICC +profile allowing accurate computation of ink +limits.
+
+ The -i file.cal parameter specifies a printer +calibration file created by printcal, +and the calibration curves will be +included in the included in +the resulting .ti3 file, so that they can be passed through to the ICC +profile, to allow accurate computation of ink limits. +The calibration is not applied +to tchart values. Note that if +the supplied ICC profile contains calibration curves, that these will +be included in the resulting .ti3 by default.
+
+The -r parameter is a way of +simulating instability in the behaviour of +the simulated +printing system. The parameter supplied to the flag will be used to +scale a random offset added to the device values (after any separation +and calibration is applied). The offset will be a normally distributed +error with an +average deviation of level%. A typically value supplied +might be 1.0 to simulate 1% randomness.
+
+The -0, -1, -2 .. -9 +parameters are a way of simulating changes in the +behaviour of the simulated printing system. The parameter supplied to +the flag will be used to modify the device values (after any +separation, calibration and device randomness +is applied) by raising them to the power of the parameter. This applies +a transfer curve to the simulated device response.
+
+The -R parameter is a way of +simulating instability in the behaviour of +the simulated +measuring system. The parameter supplied to the flag will be used to +scale a random offset added to the PCS values. The offset will be a +normally distributed error with an average deviation of level%. A +typically value supplied +might be 1.0 to simulate 1% randomness.
+
+The -u flag changes the +distribution of the random offsets applied using the -r or -R flags, from the default standard +deviation, to a uniform deviation distribution. The level is still +specified as an average deviation.
+
+The -S parameter lets a +particular random seed be used when generating random offsets, so that +the randomness can be made repeatable. Normally a different seed will +be used for each run.
+
+The -b parameter is a way of +simulating devices that have a different black point to the profile +used. This only works if an ICC profile is used, and scales the black +point to the parameter value. This will be done in XYZ space by +default, and in L*a*b* space if the -l +flag is used.
+
+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 intend +to make a profile from the resulting .ti3 file, since profiles are +always made from absolute colorimetric measurement values. Note that +this flag does nothing if the profile is an MPP or .ti3 file.
+
+Fakeread is useful in creating artificial test value for testing colprof, as well as providing one path for +turning an MPP profile into an ICC profile. If a .ti3 file is +specified instead of an ICC or MPP profile, +then the closest matching measured points in the ..ti3 are substituted +for the test values in the .ti1 +file on +output. If the .ti1 +file is a monochrome test file with a White device value, then an RGB ICC profile, MPP or .ti3 may be used, and the White +values will be translated to equal RGB values. If the .ti1 +file is a monochrome test file with a Black device value, then a CMYK ICC profile, MPP or .ti3 may be used, and the Black +values will be translated to equal CMY = 0, K = grey values. Note that +any calibration within a supplied ICC profile is not applied during the +conversion, although it will be included in the .ti3 output (see -k and -i flags for how apply calibration +curves during the conversion and/or include +a specific calibration curves in the output).
+
+If a separation device profile is provided (e.g. from CMY -> CMYK, +or perhaps CMYK->CMYK, to simulate a color correction step before +"printing"), then this will be applied to the .ti1 device values, +before converting the the device values into .ti3 PCS values.
+
+
+
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