Re: CMYK spaces used for document creation
Re: CMYK spaces used for document creation
- Subject: Re: CMYK spaces used for document creation
- From: Chris Murphy <email@hidden>
- Date: Mon, 2 Nov 2009 21:58:02 -0500
On Nov 2, 2009, at 6:59 PM, Graeme Gill wrote:
Chris Murphy wrote:
mapping of imaginary colors. And there is hardly a real world
instance of images being encoded with imaginary colors in the first
place.
Hmm. Beg to differ here. Have you taken a look at some of Bill
Atkinsons
Profile Test Images, encoded in Lab space ? Lots of wacky color values
in there, possibly due to sharpening in Lab space. Now of course there
are (by definition) no imaginary colors in the real world, but actual
processes for capturing such colors are capable of arriving at such
values,
and it helps if the color management systems can cope with it.
Agreed that the color management system needs a sort of graceful
degradation with imaginary colors. There can be better renderings than
others, but still there is no one right way to deal with it. I would
not consider the well behaved output of any/all ProPhoto RGB (or
CIELAB) based synthetic targets to be an appropriate metric for
successful CMS performance.
The assertion by Martin continues at this point, in my opinion, to be
conjecture, until a sequence for producing "bandy and ugly looking"
output using ACE in Photoshop of any version. If there is a bug there,
it should be fixed. I'd say the same thing about any product. I
wouldn't be surprised at all if a synthetic target breaks with one
kind of profile or CMM but not others. That doesn't necessarily mean
it's a real problem.
Chris Murphy
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