[argyllcms] Re: Echanging CMF

Roger Breton wrote:

I just come back from the CIE Jubilee Meeting and I'd like to experiment
with Stiles 195x 2 degree CMF. Stockman presented a paper where he
transforms his recently measured LMS spectral sensitivities to Stiles 2
degrees CMF, saying that the '31 CMF were biased from the get go, because of
the insistance of incorporating V-lambda (and we know that V-Lamda is
crooked in the blue region, for historical reasons). I never understood why
my color match yielded *good* numerical matches but *poor* visual matches
but now, I'm starting to have my doubts. Hence, the need to experiment with
different CMFs. Apparently, all the data about Stiles 2 degree CMF is on the
CVRL site?


That's where I got it from. Currently in Argyll you'd have to add
other observers in as new code and cases, and recompile.

I'll have to take a closer look at the CMF argyll's already supported.
You're ahead of the game Grame. But maybe you're going to tell me that it
won't change the visual appearance of the matches from the 1931 2 degre CMF?


That was Mark Shaw's conclusion. In some instances I found
the 10 degree observer to give better results, but then in other
cases it didn't seem to make much difference. I used
the "Shaw observer" quite a bit for proofing, and it seemed
to be fine. Of course if it was easy to create a custom set of CMF's,
then we could get a great visual match for ourselves, it just wouldn't
look as good to anyone else :-)

Graeme Gill.


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