Embedding CMYK profiles
Embedding CMYK profiles
- Subject: Embedding CMYK profiles
- From: Chris Murphy <email@hidden>
- Date: Sat, 5 Jun 2004 17:46:00 -0600
No one is doing it, and there are two reasons:
1. Good quality profiles are too large, who wants to increase file
sizes and then push them around a network all day? Especially in
prepress, print or any higher volume workflow.
2. Implementation in various applications makes it really easy for
unsuspecting users to get undesirable conversions, merely because a
profile is present in a CMYK file. Example: several images with
different amounts of black generation, with their respective profiles
embedded in them, preserved upon placing into either QuarkXPress or
InDesign, handoff to printer who uses SWOP v2 if they use color
management at all, these images get reseparated using the Kgen in the
SWOP v4 profile.
Both problems are important, and actually perhaps the second is more
important than the first, but for the moment I'd like to generate a
discussion about solving the first problem. It's clear people are not
embedding profiles because they take up too much space, in various
workflows. Even Bruce and I are not embedding profiles in our CMYK
images for RWCM because we'd be pushing almost an extra gig of data
around that was totally pointless and unhelpful. RGB images are tagged
of course, and we convert using custom press profiles, but we save the
images without embedding, and they get placed into a document that
assumes the press profile as source. So they are "tagged" but the
profile is not embedded.
I think we need a new means of embedding either subset CMYK profiles
(i.e. the AtoB1 tag + header only), or in the world of the internet, to
have URL-based profile embedding. Yes there are all sorts of issues
that arise from this but I think it needs to be discussed seriously
because embedding profiles in CMYK images is pretty much a completely
rejected concept, with exceptions fairly few and far between. Tagging
makes the image data MORE valuable, so it is necessary and helpful to
solve this problem.
Thoughts anyone?
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6) Murphy
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