Re: CMYK vs RGB with pantone colours
Re: CMYK vs RGB with pantone colours
- Subject: Re: CMYK vs RGB with pantone colours
- From: Chris Murphy <email@hidden>
- Date: Mon, 3 Feb 2003 10:59:00 -0700
Pete Carter wrote:
I just got to thinking that a lot of our proofs have client defined
spot
colour content alongside scans and logos that are all included in a
final
output via Quark. Everything is outputted from Quark as CMYK to our
Epson
5000 via Fiery RIP....that9s another story altogether!... I wondered if
there was a system anywhere that customizes the workflow so that the
spot
colours go out as RGB separately from the rest of the CMYK content.
Would
this be any advantage given the larger colour space of RGB being able
to
represent the pantone spot colours more accurately?
Probably yes. If you are using the Fiery's ability to simulate a press
condition (or contract proofer), all CMYK content you send it is
assumed to be "press CMYK" and the simulation profile you have set
applies as the source profile for everything that is CMYK including
Pantone colors (which have only CMYK equivalents associated with the
Pantone reference, produced by the printing application and its Pantone
libraries). However, Fiery RIPs have a spot color option (I forget the
exact wording), which will use the RIPs built in tables to convert
Pantone colors into the specific values needed by the printer to print
them. These tables are sometimes OK, sometimes not OK. I've usually
found the recent products to be fairly acceptable, anything much older
doesn't seem to work well. Either they weren't made correctly to begin
with, or the device behavior (media/inks, etc.) have drifted since the
time the tables were originally built.
The problem is, how do you get something like QuarkXPress to output
only Pantone equivalents as RGB? You'd need something like Compass Pro
XT to change the document prior to PostScript being generated. Or
iQueue to change just the Pantone references in the PostScript file
after it's produced from QuarkXPress. But make sure you turn off the
Fiery RIP's spot color handling or it will still use its tables instead
of the custom RGB values you've provided.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0201773406)
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