Re: Default ICC profiles
Re: Default ICC profiles
- Subject: Re: Default ICC profiles
- From: Chris Murphy <email@hidden>
- Date: Tue, 30 Jan 2001 23:30:11 -0700
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Chris Murphy <email@hidden> wrote:
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>Service bureaus tell me that embedded ICC
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>profiles in PDF files are causing them LOTS of problems. In some cases
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>these grayscale images are converted to 4/c unless the embedded profile
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>is removed.
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>When I save a grayscale image as PDF and embed a 20% dot gain profile,
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>then open the file in Acrobat 4.05, parts of it are PINK and will print
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>PINK. I haven't tried making separations yet.
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>Anyway, as far as I can tell this is certainly a bug in various prepress
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>and RIP systems that's causing this. But it is happening and I'm not
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>clear on exactly why. So at this point I'm not embedding ICC profiles in
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>PDF's.
Henrik Holmegaard wrote:
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ProfileMaker has a kTRC function we've spoken of on and off.
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Printopen 4 also supports it. Your production-level ICC color server
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should support this technology.
Henrik - did you not read a word what I wrote? I'm taking about service
bureaus. There is no production level ICC color server in an overwhelming
majority of service bureaus over here. And I'm not using embedded
profiles in PDF documents because more often than not it screws things
up. In particular it hoses grayscale images when embedding a grayscale
profile - then opening it up and printing it from Acrobat 4.
Right now I see this as mostly broken at this point in regards to PDF.
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And you should of course tag grayscale objects just as much as RGB or
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CMYK objects. Not tagging device dependent objects in this day and
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age is a bad idea.
Explain this in lieu of getting PINK images in Acrobat after embedding
profiles. I'm sorry but my experience with service bureaus and PDF files
with embedded ICC profiles is NOT good right now. It makes *more* sense
from a reality standpoint to not use them until we figure out what's
causing the problem - and at this point service bureaus are slow to get
interested in figuring this out. Many who are getting tools to work with
PDF and ICC profiles that I've talked to are using those tools to STRIP
ICC profiles from their images.
What you are talking about is theory, and ideal workflow. Not real life.
In reality this stuff is a major question and so far I haven't heard a
whole lot of answers yet. I wish I did because I'm about as much of a
proponent of profile embedding as you get, but not when it screws stuff
up.
Chris Murphy