[Openicc] [Fwd: icm profiles in debian]

[Kai-Uwe Behrmann]

Hello Bernhard and bug hunters,

there are different aspects for ICC profiles to work like expected.

The most important thing, beside your/debian's requirement for proper 
licensing, is its correct colorimetry. That can be expected to be right 
for the icc-profiles-free included sRGB.icc from lcms and the same from 
ArgyllCMS called sRGB.icm. For instance the packages in question could 
require icc-profiles-free and a sRGB.icc profile gets installed on the 
system. Having only one sRGB profile installed is from a usability point 
of view very plausible. So requiring icc-profiles-free appears a logical 
option.

The next is, applications need to identify the profile. Some 
applications search profiles by name. However, it is no good idea to 
reuse the "sRGB Color Space Profile.icm" name of the original HP 
profile, as that will cause confusion among users. But you might 
consider to replace the offending sRGB.icm with the sRGB.icm from the 
Argyll package.

The old profile names need to be replaced by the new name in 
configuration files, source code and documentation. grep is your friend. 
Ideally the unit tests of the packages in question can spot issues.


As you asked about, a Scarse sRGB profile variant has colorimetrically 
some errors. That might be fixed in newer versions. I do not know.
http://lists.freedesktop.org/archives/openicc/2011q4/004425.html

An newer review about sRGB profiles is here:
http://ninedegreesbelow.com/photography/srgb-profile-comparison.html


Hope that helps,

Kai-Uwe Behrmann


Am 02.02.2013 16:51, schrieb Bernhard Reiter:
> Forwarding this to the OpenICC maling list requesting their help as per
> suggestion of user oy (Kai-Uwe Behrmann) in #scribus.
>
> Kind regards
> Bernhard Reiter
> PS: Please CC me (and the people I'm CC'ing) as I'm not subscribed to
> this list!
>
> -------- Weitergeleitete Nachricht --------
>> Von: Stuart Prescott <stuart at debian.org>
>> An: Oleksandr Moskalenko <malex at debian.org>, Jonas Smedegaard
>> <dr at jones.dk>, Bernhard Reiter <ockham at raz.or.at>
>> Betreff: icm profiles in debian
>> Datum: Sat, 2 Feb 2013 00:58:58 +0000
>>
>> Dear icc-profiles-free maintainers,
>>
>> You may or may not have noticed a series of bugs filed about the inclusion of
>> sRGB.icm from HP in a variety of different packages. Modified versions of this
>> file are not distributable so inclusion in packages fails DFSG #3. We now have
>> bugs #657281, #699301, #699304, #699305 and #699306 for packages that
>> include this file.
>>
>> While trying to understand what can be done to solve this problem, I realised
>> that a number of other packages also contained ICC/ICM profiles (e.g. krita,
>> argyll, lcms, icc-profiles-free etc) and that there was a chance that one of
>> these Free profiles would be suitable as an immediate replacement for the
>> problematic profile currently in Debian. (I also wondered if these package
>> should be using icc-profiles rather than shipping their own versions, but
>> that's another question for another day.)
>>
>> At this stage, however, I reach my limit of knowledge about colour profiles and
>> hope that perhaps one of you would be able to provide advice on the
>> abovementioned bugs. Can one of the other sRGB.icm in Debian that claims to
>> come from lcms or scarse and be under a permissive licence be used as a drop-
>> in replacement for this file? Can the icc file from icc-profiles-free be
>> utilised? If this can be done, then we potentially have a nice solution to 5
>> RC bugs...
>>
>> cheers
>> Stuart
>>
>> --
>> Stuart Prescott    http://www.nanonanonano.net/   stuart at nanonanonano.net
>> Debian Developer   http://www.debian.org/         stuart at debian.org
>> GPG fingerprint    BE65 FD1E F4EA 08F3 23D4 3C6D 9FE8 B8CD 71C5 D1A8
>> GPG fingerprint    90E2 D2C1 AD14 6A1B 7EBB 891D BBC1 7EBB 1396 F2F7
>
>
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