[Digikam-devel] [Bug 220312] Color management for CMYK images missing

[Milan Knizek]

https://bugs.kde.org/show_bug.cgi?id=220312





--- Comment #4 from Milan Knizek <knizek volny cz>  2009-12-29 22:43:39 ---
There appears to be a standardisation effort in the industry to introduce
recommended ICC profiles for a few selected printing conditions. The printing
houses are then promoted to calibrate their printers to match the profiles.

In Europe, there is an initiative called ECI, which offers a set of ICC
profiles for download for free. Their profiles are based on freely available
specifications made by FOGRA.

Similar efforts probably exists for other parts of the world (US, Japan, etc.).

For the situations, when the printer is unknown, ECI recommends [1] to use ISO
Coated v2 300% ICC profile for CMYK images. The profile is made by ECI
according to specifications of FOGRA39L [2].

At the moment, it is unclear under which license the ECI ICC profiles are
available - I have sent them an email to confirm if free distribution with
GPL'ed software is possible.

However, since the FOGRA specifications are free, everyone can prepare the ICC
profiles on his/her own. Kai-Uwe Behrmann did so (using Argyllcms) and the
profiles are available in his project Oyranos [3].

Kai-Uwe confirmed to me:
"The Cmyk profiles in Oyranos are licensed like libpng and thus are 
liberal to use and redistribute.
I wish to see the profiles distributed with Oyranos. So I would be glad 
when digikam avoids placing them directly into /usr/share/color/icc .
Digikam might choose a subdirectory or a application specific path.
Otherwise I am fine."

Unless anyone else has another opinion, I would propose to use
coated_FOGRA39L_argl.icc as the standard CMYK profile for digiKam.

[1] http://www.eci.org/doku.php?id=en:colorstandards:offset "Which profile
should I use?"

[2] http://www.fogra.org/products-en/icc1.html

[3] http://www.oyranos.org/#about

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