Re: Photoshop Gamut warning vs ColorThink (Chris Cox)
Re: Photoshop Gamut warning vs ColorThink (Chris Cox)
- Subject: Re: Photoshop Gamut warning vs ColorThink (Chris Cox)
- From: Roger Breton <email@hidden>
- Date: Sat, 23 Feb 2008 11:05:24 -0500
Hi Klaus,
I revisited your documents and wanted to ask some follow-up fragen, if I
may.
First, in your Readme, you suggest converting to the monitor profile, as the
destination. Easy enough. Ideally, however, to make the most of this
particular conversion, as in softproofing in general, do you recommend
RelCol or AbsCol?
Second, could other destinations be used? Such as AdobeRGB or sRGB? To
reveal out of gamut colors from the chosen source CMYK space to our choice
of destination space.
Interesting technique, by the way. Danke shoën! And it works on images too?
> Another way is to calculate the differences between the original and the
> converted image in Lab or CAM02 Jab and to add L=50 to the result
> afterwards.
>
> The result is an image where Lab 50/0/0 means "no difference" and every
> color cast or lightness change points out the amount *and direction* of
> differences. I used this technique to reveal gamut problems in
> softproofs, see
> <http://lists.apple.com/archives/colorsync-users//2007/Dec/msg00004.html>
>
> Klaus Karcher
Roger Breton
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