CMYK Proofing way off?

David145

• 2010年12月14日 00:41

Is anybody else seeing that when a CMYK Proof Profile is selected the image looks incredibly flat & washed out?

However, on output the resulting file looks correct.

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  thowi

  • 2010年12月14日 09:28

  [quote="David145" wrote:
  Is anybody else seeing that when a CMYK Proof Profile is selected the image looks incredibly flat & washed out?
  
  However, on output the resulting file looks correct.

  yes, that's "correct" (i.e. the dull preview actually makes sense).
  CMYK profiles (as all the paper profiles) do not contain black points as low as monitors or generic RGB color spaces (with Lab 0|0|0 as black point). The black point of those CMYK profiles is mostly around L*9 or so (for coated papers).
  In other words: the contrast ratio of the CMYK print is limited (compared to your monitor).
  
  Now, when you open your CMYK image in Photoshop it is displayed at a too high contrast ratio by default (unless your monitor is calibrated to match the contrast ratio of the respective paper)... as the actual black point of the paper is scaled to the monitor's black point. However you can replicate the preview of C1 when you go to the proof settings in Photoshop, select the respective CMYK profile, set the rendering intend for the conversion to rel.col + BPC and for the monitor preview select "simulate black ink". In terms of color managment with this setting the image is displayed relative colormetric.
  
  Whether the "dull" preview or the contrastier preview matches the real print better that is a completely different story (as here the entire softproof workflow comes into play).

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