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Re: RGB source spaces for newsprint separations....
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Re: RGB source spaces for newsprint separations....


  • Subject: Re: RGB source spaces for newsprint separations....
  • From: Henrik Holmegaard <email@hidden>
  • Date: Mon, 27 Aug 2001 23:05:14 +0200

"James Kober" <email@hidden> wrote:

Any difference between Adobe RGB compared to ColorMatch RGB (source spaces) when
making separations for the small newsprint gamut?

Generally, a monitor-size RGB working space like ColorMatch RGB is what you want for newsprint. I seem to remember that this is what IFRA recommends.

But newspresses may print a mix of jobs. If your press runs jobs on multiple papers, and you wish to use a single RGB space, then it's more of an open question.

Keep in mind that the Perceptual intent maps both tone and color, and the Relative Colorimetric intent maps tone if the CMM and application software supports black point compensation. This means that in practice you should stick to Perceptual or risk clipping shadow lightness levels in your RGB working space to L 30 of your print production space -:).

(BTW this issue also affects reseparation, say if you have incoming CMYK data in an offset space with a lightness range of L 94 to L 10, and you pick Relative Colorimetric (no BPC) to reseparate into a newsprint space with a lightness range of L 84 to L 30, you are going to lose 20 levels which all map to L 30 in the destination profile, so again for a one-shot choice that works the same in Pshop 6 as in RIP ICC frontends and anywhere else, use Perceptual for reseparation.)


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