From: "Jan U. Hasecke" <juh+ntg-context@mailbox.org>
To: ntg-context@ntg.nl
Subject: Re: Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Date: Wed, 14 Nov 2018 11:41:30 +0100 [thread overview]
Message-ID: <7bee59a8-60c0-dbc0-259f-32ac8a4e4310@mailbox.org> (raw)
In-Reply-To: <3ee393c1-46c3-b6f6-0357-e6dc7f2b49de@mailbox.org>
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I forgot the archive. :-(
Am 14.11.18 um 11:39 schrieb Jan U. Hasecke:
> Hi all,
>
> attached you find my colormanagement tests and I need your help to
> understand and debug the situation.
>
> I am testing together with a friend of mine, a professional
> colormanager, who does not know ConTeXt.
>
>
> There are several files in the archive:
>
> The differences in the files are the color definition and the color
> profile used.
>
> - rgb-xxx.tex – colors are defined with RGB values only.
>
> - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values.
>
> The cmyk colors are derived from the rgb values using gimp and the
> color profiles sRGB/ISOCoated
>
> - cmyk-xxx.tex – colors are defined with CMYK values only.
>
> The xxx stand for two color profiles: iso-coated and swop.
>
> What I see is this:
>
> Colors in pdfs are the same no matter what color profile I choose.
>
> With rgb values and rgb/cmyk values I get the same colors in pdf (the
> wrong ones).
>
> With cmyk values only I get other colors in pdf. Next week my friend
> will test if these are the right ones.
>
> I have many questions:
>
> 1. Is colormanagement working in ConTeXt at all?
> 2. Is my code correct?
> 3. Why do pdfs with different color profiles show the same colors?
> 4. Why does ConTeXt not take the cmyk colors from \definecolor when
> there are rgb values as well?
> 5. Where can I define a coresponding rgb profile? In Scribus you have to
> define two profiles (eg. sRGB and ISOCoated) to make colormanagement work.
>
> TIA
> juh
> ___________________________________________________________________________________
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>
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> ___________________________________________________________________________________
>
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2018-11-14 10:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-09 15:24 Colormanagement Jan U. Hasecke
2018-11-09 16:03 ` Colormanagement Hans Hagen
2018-11-09 16:18 ` Colormanagement Tomas Hala
2018-11-10 13:29 ` Colormanagement Jan U. Hasecke
2018-11-09 16:20 ` Colormanagement luigi scarso
2018-11-10 13:34 ` Colormanagement Jan U. Hasecke
2018-11-10 16:24 ` Colormanagement Hans Hagen
2018-11-12 8:02 ` Issues with RGB to CMYK conversion with color profiles (was: Colormanagement) Jan U. Hasecke
2018-11-12 8:34 ` Issues with RGB to CMYK conversion with color profiles Hans Hagen
2018-11-14 10:39 ` Issues with RGB to CMYK conversion with color profiles (was: Colormanagement) Jan U. Hasecke
2018-11-14 10:41 ` Jan U. Hasecke [this message]
2018-11-14 13:58 ` Peter Rolf
2018-11-14 14:36 ` Jan U. Hasecke
2018-11-14 15:04 ` Peter Rolf
2018-11-14 15:31 ` Jan U. Hasecke
2018-11-14 15:51 ` Issues with RGB to CMYK conversion with color profiles Wolfgang Schuster
2018-11-18 18:26 ` Hans Hagen
2018-11-19 9:56 ` Henning Hraban Ramm
2018-11-19 10:14 ` luigi scarso
2018-11-21 14:01 ` Jan U. Hasecke
2018-11-21 14:42 ` luigi scarso
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