Re: mapping extreme colours perceptually
Re: mapping extreme colours perceptually
- Subject: Re: mapping extreme colours perceptually
- From: Roger Breton <email@hidden>
- Date: Wed, 22 Aug 2001 08:34:00 -0400
Thomas,
I have noticed the way Lightness map differently in Photoshop 6 using either
ACE or ColorSync on your "U.S. Web Coated (SWOP) v2" profile when I choose
either Perceptual or Colorimetric Intent. Other than the "tone maping" that
goes on, isn't there also a difference in the resultant CMYK colors using
either of those Intent? Please correct me if I am wrong, both Intents in
this ICC profile will not map saturated colors to the same CMYK values?
Roger Breton, Laval (Qc) Canada
>
And no, the CMM does not "handle it". I don't know of any CMMs on
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the market that perform any smart gamut mapping. All of them just
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use the look up tables built into profiles to convert from source to
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PCS and from PCS to destination. The only non-standard CMM
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processing in common use the Adobe's "black point compensation",
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which is more tone mapping rather than gamut mapping.
>
>
Thomas Knoll.