Re: soft proofing of spot colours
Re: soft proofing of spot colours
- Subject: Re: soft proofing of spot colours
- From: Klaus Karcher <email@hidden>
- Date: Tue, 22 Jan 2008 20:33:28 +0100
Matthew Larmour wrote:
It would seem
straightforward enough to do this for solids, but what happens when
you throw a spot tint into the mix? Or a mix of different spot
colours? I can't see such things being accurately softproofed.
You are right: as long as there are solid spot colors and they are
in-gamut, everything works quite well -- but as soon as they are
halftone spot colors or even mixes with CMYK or other spot colors,
softproofs (and also most digital proofs) are (more or less accurate)
estimations (usually based on a modified Neugebauer model). Photoshop's
model is very simplistic: you can define a TRC for all spot colors in
the color settings and you can define the "solidity" of each spot color
channel individually -- things like print sequence and ink trapping
don't exist in the model or are at least not user-controllable.
Proofing RIPs offer more sophisticated controls usually: E.g. in EFI
Colorproof you can enter the Lab values of a printed step-wedge of your
spot color to get more accurate halftone results at least, in GMG
ColorProof you can enter Lab values for 2-color mixes (e.g. for duotone
proof) AFAIK.
To cope with more sophisticated tasks like spotcolor-separations (very
popular in the packaging industry), you need special tools like
ProfileMaker Packaging.
Klaus
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