[argyllcms] Re: Devicelink Black Generation
- From: Fabrizio Levati <fabrizio.levati@xxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Thu, 07 Aug 2008 14:11:52 +0200
Klaus,
No luck even with littleCMS.
I tried the option you suggested, then I read again what you posted and
realized that the ISOnewspaper26v4.icc I am using had a GCR with maxK
limited to 95%. At this point I tried editing the original profile and
recreated the DVLP but, as soon as I use the profile to convert my PDF file
(I am using Callas PDF toolbox to do so), I get my 100K text transformed to
something like 78C 72M 62Y 81K that is by the way exceeding the original
profile TAC limit.
Any idea about where am I going wrong?
Fabrizio
Il 07/08/08 12:04, "Klaus Karcher" <lists@xxxxxxxxxxxxxxxxx> ha scritto:
> 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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