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RE: Strange converion behavior
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RE: Strange converion behavior


  • Subject: RE: Strange converion behavior
  • From: bruce fraser <email@hidden>
  • Date: Fri, 4 Feb 2005 17:25:58 -0800

Title: RE: Strange converion behavior
I've seen this fairly often. Bear in mind that the blues that make up the saturation hole are somewhat unlikely to occur in natural images unless someone has a very heavy hand on the saturation control.

The choice of gamut mapping makes a difference to this behavior. It's ore obvious with ChromaPlus than with either Classic or Colorful, despite GMB's insistence that the gamut mapping only affects perceptual rendering.

I haven't found the saturation hole to a problem in doing conversions, but it does mean you need to be careful if you edit in that CMYK space.

Bruce

At 7:46 PM -0500 2/4/05, Mike Eddington wrote:
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<4.7 is now up there with my "gold standard" for blues which has been the GMB packages.>
So if you (or anyone out there) perform the same conversion with a GMB profile (Granger Rainbow in Adobe RGB to CMYK using rel. colorimetric) you don't get a large hole lookin' thing in the middle of the blues? Just wondering if its my profile(s). I have decent results with the perceptual intents, but rel. coloirmetric just looks whacked.
mike

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References: 
 >RE: Strange converion behavior (From: "Mike Eddington" <email@hidden>)

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