Re: Managing Merge Colors in Photoshop
Re: Managing Merge Colors in Photoshop
- Subject: Re: Managing Merge Colors in Photoshop
- From: Ray Maxwell <email@hidden>
- Date: Wed, 01 Dec 2004 11:04:37 -0800
Roger,
Are the spot colors you have selected in the gamut of the CMYK working
space....or are they very saturated colors that are outside the gamut?
If they are outside the gamut they will be very muted after conversion.
They will be truncated into the gamut. What are the Lab values of the
spot colors?
Ray
Roger Breton wrote:
Suppose you have a CMYK image with four PMS spot color channels. Suppose the
CMYK channels were blank and suppose you issue the Merge Spot Channels in
the Channels palette after shift-selecting the four spot channels. Is there
any way to predict what the final converted CMYK colors will be?
I tried figuring the algorithm yesterday and I could not do it. Photoshop
must be doing some kind of blends in Lab, internally, between each spot
channels Lab values but there is nothing anywhere that I noticed that says
how these colors relate to the CMYK Working space? And the gamut mapping
that must be going on between the two.
The reason I ask is because, invariably, the results are much desaturated
compared to the pure PMS spot colors definition. I think I understand why I
am getting the colors I am getting but I'd like to understand the process a
little better.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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