[argyllcms] FWA content found in 'spec2cie', but not in 'profile'

  • From: "Thomas Baumann" <thomas@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 9 Jan 2007 12:54:06 +0100 (CET)

Hello list,

I am a new member. After having had a good deal on one of the last DTP20
(without UV-cut filter) I am now trying to set up an RGB printer profiling
workflow. Everything seems to work fine, ArgyllCMS is a great piece of
software!

There is something about FWA content detection I do not understand. In my
case there is FWA recognized in 'spec2cie' but not in 'profile':

$ profile -f -i D50 test
~1 FWA content = 0.000000

$ spec2cie -f test.ti3 test_2.ti3
Found media white: 0.864557 0.888193 0.766133
~1 FWA content = 0.736019

Looking into the source code it seems both programs use the same FWA
detection function 'sp2cie->set_fwa' in xicc/xspect.c.

Here are some ti3 file headers that could be of relevance, as well as the
spectral data for a white patch reading:
DEVICE_CLASS "OUTPUT"
TARGET_INSTRUMENT "Xrite DTP41"
COLOR_REP "RGB_LAB"
SPECTRAL_BANDS "31"
SPECTRAL_START_NM "400.0"
SPECTRAL_END_NM "700.0"

SAMPLE_ID RGB_R RGB_G RGB_B LAB_L LAB_A LAB_B SPEC_400 SPEC_410 SPEC_420
SPEC_430 SPEC_440 SPEC_450 SPEC_460 SPEC_470 SPEC_480 SPEC_490 SPEC_500
SPEC_510 SPEC_520 SPEC_530 SPEC_540 SPEC_550 SPEC_560 SPEC_570 SPEC_580
SPEC_590 SPEC_600 SPEC_610 SPEC_620 SPEC_630 SPEC_640 SPEC_650 SPEC_660
SPEC_670 SPEC_680 SPEC_690 SPEC_700
162 100.00000 100.00000 100.00000 95.50371 1.517287 -2.867686 45.47189
69.52926 86.48203 93.94064 95.54589 95.0576 93.4493 93.08309 92.96101
92.01801 90.79728 89.61929 88.73121 88.68849 88.76783 87.96216 87.15038
87.09545 87.4403 88.0415 88.8014 89.61929 90.41276 90.95903 91.56023
92.61311 93.56832 93.82467 93.84909 93.95285 94.0322

Does anyone have an idea what could be causing this? Am I
understanding/doing anything wrong?

Thanks a lot,
Thomas



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