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: Klaus Karcher <email@hidden>
- Date: Sat, 23 Feb 2008 15:10:14 +0100
Chris Cox wrote:
True, Photoshop could provide more of a "X deltaE out of gamut" display
instead of the current binary form. It's just not trivial to overlay such
information on a full color image (unless you have another color we can
use
that doesn't appear in the image :-).
Herman Teeuwen wrote:
Or a pseudo color display like Norman Koren uses in Gamutvision:
http://www.gamutvision.com/docs/gamutvision_displays.html#imagediff
This is one (very useful) way to visualize the amount of clipping (or
color differences in general).
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
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