Re: CMYKOG profiles in PosterPrint RIP?
Re: CMYKOG profiles in PosterPrint RIP?
- Subject: Re: CMYKOG profiles in PosterPrint RIP?
- From: email@hidden
- Date: Sun, 4 Jan 2004 23:00:47 EST
In a message dated 1/4/04 6:51:49 PM, email@hidden writes:
>
I'm thinking about how to handle this in Gimp-Print. The option that
>
seems most obvious to me is to offer a choice between conventional
>
4-color and CMYKRB, and if the user selects CMYKRB, to perform an
>
operation analogous to GCR to generate red and blue if there's a large
>
component of blue (C+M) or red (M+Y) left over, after subtracting out
>
virtual (CMY) black (real black is removed from CMY in the GCR
>
process).
>
Color channel generation is indeed similar to black generation, though
instead of adding one variable, it multiplies with each added channel, so that
you
have multiple ways to generate a given RGB value. Generating the extra colors
out of CMYK accomplishes little, however, since it limits the result to the
CMYK gamut. More typically the extra colors are added only when the CMYK gamut
is
exceeded (skeletal n-color generation) or factored in from the start (max
n-color generation). I suspect that most profiling for the upcoming Epsons
will
actually occur in RGB, with the splits occuring invisibly in the RIP or
driver... which won't be much help to those who have to develop the n-color
architecture of those RIPs and drivers.
C. David Tobie
Product Technology Manager
ColorVision, Inc.
email@hidden
www.colorvision.com
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