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Strange behaviour in Photoshop CS
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Strange behaviour in Photoshop CS


  • Subject: Strange behaviour in Photoshop CS
  • From: Juanje Luzardo <email@hidden>
  • Date: Tue, 10 Feb 2004 12:49:45 +0000

Hi,

I'm very confused with the new histogram in PS CS. You can try a little example:

Fill a AdobeRGB document with a gradient (128-128-128 to 170-170-170), you get a medium tone image, with no whites and blacks. Convert to AdobeEuroscalecoated v2 (black point on). If you see the histogram palette in cmyk mode you get clipping in lights. In luminosity mode you get a more real data.

The trouble: i edit all my photos to Press in rgb mode all the workflow, i analize the whites and blacks in the histogram in rgb mode, reading the rgb and cmyk values in the info palette. When i convert to cmyk the values change a lot in the cmyk histogram (cmyk mode), getting clipping whites when there is no white in the original photo! If a change to luminosity mode i get a more accurate histogram, but i think luminosity is lighter that the full cmyk mode. What am i missing? Can anyone to help me to understand the histogram behaviour in PS CS?

Thanks in advance
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