[argyllcms] Re: Devicelink Black Generation

Fabrizio Levati wrote:
I am trying to create a devicelink profile to convert from ISOwebcoated to ISOnewspaper [...] what I am trying to achieve is to create a devicelink with my own GCR and preserve the pure (100%) BLACK in the text. 
[...]
I think littlecms <http://www.littlecms.com/> is more suitable for this purpose. Try something like this:
path/to/lcms/bin/icclink -t1 -f1 -o web2news_lcms.icc ISOwebcoated.icc ISOnewspaper.icc
(relative colorimetric, no black point compensation, -- Attention! Clipping!) 

this:
... icclink -t1 -b -f1  ...
(relative with black point compensation)

this:
... icclink -t0 -f1 ...
(perceptual)

or this:
... icclink -t3 -f1 ...
(saturation)
Your destination profile establishes the separation. It must allow 100% K in either case. 

the most important lcms-icclink-flags are:
-o<profile> - Output devicelink profile. [defaults to 'devicelink.icm']
-t<0,1,2,3> - Intent (0=Perceptual, 1=Colorimetric, 2=Saturation, 3=Absolute) 
-c<0,1,2> - Precission (0=LowRes, 1=Normal, 2=Hi-res) [defaults to 1]
-n<gridpoints> - Alternate way to set precission, number of CLUT points
-d<description> - description text (quotes can be used)

-b - Black point compensation
-f<0,1> - Black preserving 0=off, 1=K ink only 2=K plane


Klaus

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