[Digikam-devel] [Bug 256023] Cannot work with Sigma-RAW-files (X3F)

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=256023





--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2010-11-04 10:05:31 ---
Michael,

See below a private email thread about Sigma RAW file support:

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RAW files and conversions for ...Sigma SD10
3 messages
Janox <janox at tiscali.it> 28 août 2010 10:15
À: caulier.gilles at gmail.com
Hello,
After downloading and using the last version of Digikam, I have to thank you
for your
great work, this software is really wonderful, now I can abandone Windows!
In order to help your team to develope the next releases of Digikam, I send you
via ftp
some RAW files of my camera (Sigma SD10), even if Foveon sensor is no longer
supported [ :-( ].
You'll find (at ftp sit e zeus.serveft p.net) the
following files :
- Sigma RAW files (.X3F)
- JPG converted by Sigma Photo Pro 4.0 (X3F setting, no any adjustment)
- JPG converded by LightRoom -Win32- Trial version (no any adjustment)
(I placed in each photos star marks (3star), some tags, IPTC data, just to
evaluate the import function)
- .XPM files by Lightroom with additional data.
My best regards for this project, it's so admirable your team produce a package
better than commercial software, and with a constant improving! BRAVO!
Mario

Gilles Caulier < caulier.gilles at gmail.com> 28 août 2010 11:22
À: Janox <janox at tis cali.it>, Alex Tutubalin <lexa at lexa.ru>
Janox,
To proces s RAW files, digiKam us e libraw.
http://www.libraw.org
Since 0.9.x releas e (if i remember) libraw author (Alex Tutubalin)
have removed Foveon support from the implementation, about
incompatibility of license of this code taken from dcraw.
I recommend to as k to Alex directly for more information about. I s et
him in CC from this mail.
All the best
Gilles Caulier

Alex Tutubalin < lexa at lexa.ru> 28 août 2010 12:37
À: Janox <janox at tiscali.it>
Cc: Gilles Caulier <caulier.gilles at gmail.com>
Hello Mario!
Yes , Gilles is right, the Foveon sensor is unsupported by LibRaw because of
two causes :
- there is no way to get good color from this s ens or. Ever Sigma own software
produces very strange
colors from these cameras (and, sure, different versions of Sigma s/w produces
very different colors
from the same shot of ColorChecker table).
- the Foveon parser code (part of Dave Coffin's dcraw.c program) is GPL
licensed. Our library (LibRaw)
has more liberal license since version 0.9, so no way to use this code and no
format information from
Foveon/Sigma to make our own parser. All other dcraw.c code has very liberal
license, so no problem
with other (Bayer sensor) cameras .
So, we decided to drop Foveon support. Sorry.
Alex Tutubalin, LibRaw team.

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