[argyllcms] Re: Snapshot V0.70 Beta 3 test now available.

Klaus Karcher wrote:
I did not find the time to test the eye-one driver, but made some tests with profile an icclink (argyllV0.70Beta3_osx10.3_bin).
I found some strange discrepancies between the -kp parameters in icclink and profile: 

I made two proflies:

profile -D"F39-test" -kp 0.0 0.2 0.9 1.0 0.6 -l320 -L98
     -S adobe_sRGB.icc -cmt -dpp FOGRA39

mv FOGRA39.icc F39-test-dev.icc

icclink -G -ip -cmt -dpp -kp 0.0 0.2 0.9 1.0 0.6 -l320 -L98
     adobe_sRGB.icc F39-test-dev.icc F39-test-lnk.icc

then I tested the results by converting a RGB gray ramp using cctiff:

cctiff -ip adobe_sRGB.icc -ip F39-test-dev.icc RGB-ramp.tif test-dev.tif

cctiff F39-test-lnk.icc RGB-ramp.tif test-link.tif
The separations look completely different, see attached plot "dev(thin)_vs_link(bold).pdf" 

The basic curve is the same, but the K generation L* control level
is a bit different (mainly offset) between the two approaches.
This turns out to be due to a collection of minor bugs,
the most significant being that the white and black points
of the newly created profile aren't being recognized for
the inversion and gamut mapping steps. There were also
issues with the exact colorspace the K generation curve
L* control level was in. This should be fixed in the
next release.


BTW: is there no -D switch for icclink?


Not at the moment. I'll see about adding them.

Graeme Gill.

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