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Input/Output/Workflow Scanning, printing, color management, and discussing best practices for control and repeatability

Converting CMYK to RGB and back to CMYK.

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  #21  
Old 11-02-2010, 05:50 PM
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andrewrodney andrewrodney is offline
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Re: Converting CMYK to RGB and back to CMYK.

You’ll never see a ProPhoto display because two of the colors defined in that color space fall outside human vision!

If you take a document in ProPhoto, Adobe RGB and ColorMatch, convert correctly to the CMYK output profile, the differences should be tiny on output. If the output profile is truly messed up, had some funky Perceptual table (begging the question, why not see the soft proof and pick RelCol), the final conversion should not look “too saturated”. Something wrong happened here.

The bigger difference here is that sRGB and ProPhoto RGB have a 2.2 gamma encoding, Colormatch a 1.8 to help account for dot gain in the conversion. Nothing here would affect saturation to the degree I hear being described.
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  #22  
Old 11-02-2010, 06:15 PM
pixelzombie pixelzombie is offline
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Re: Converting CMYK to RGB and back to CMYK.

this is through a Lambda, so the file never gets converted to CMYK..i think the problem occurs in the RIP as the image looks fine on screen...
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  #23  
Old 11-02-2010, 07:13 PM
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andrewrodney andrewrodney is offline
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Re: Converting CMYK to RGB and back to CMYK.

CMYK or RGB (Lambda), you should not be seeing a big difference here with good profiles based on the working space. Yes, colors within the larger gamut working space that would be clipped in a smaller space (Adobe RGB vs. sRGB) could be converted into the output color space (Lambda or even CMYK). But that should only affect some colors at the edge of saturation. The overall look should not be “too saturated”. And the Lambda output color space gamut isn’t that large. Certainly larger than most four color CMYK devices. But compared to say a modern 8-10 color ink jet, pretty small.
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  #24  
Old 01-06-2011, 11:56 AM
ftp-Jeff ftp-Jeff is offline
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Re: Converting CMYK to RGB and back to CMYK.

Good grief! When I read some of this I shudder.....

No wonder we are getting more and more clients through our studios!

Keep it going folks!
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