Fwd: [Lcms-user] 2 Linux profile packages

[Boudewijn Rempt]

I didn't do my homework yesterday, but the attached mail to the lcms list 
shows that we should use lcms as much as possible for all our xyz/lab/srgb
conversion and profiling needs -- and we should include these profiles in 
Krita as soon as we support xyz/lab. 

We should lcms as much as possible, it gives us an accuracy that it would be 
folly to try to reimplement ourselves. In particular, the transformation of 
rgb (for instance, from a digital photo) to cmyk shouldn't be done through 
some home-grown xyz function, but with lcms.

Same with painting on cmyk: an rgb color from a color selector should be 
transformed using the lcms transform of (rgb + display profile) to (cmyk + 
cmyk layer profile) -- we shouldn't try to do an intermediary transform 
through xyz here. lcms can do out of gamut warning, by the way, making all 
out-of-gamut colors a bilious green or orange. We should add this to the 
toQImage routine in kis_colorspace_cmyk.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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