[Digikam-users] LightZone

[Gilles Caulier]

2008/2/5, Markus Spring <m.spring at gmx.de>:
>
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> Gerhard Kulzer wrote:
> | if you're tagging your whole collection you might be interested in
> reading this:
> | http://wiki.kde.org/tiki-index.php?page=DigikamDAM
> Gerhard, this is an excellent article! Thank you for this compilation.
>
> One question regarding dng: As far as I know there is no linux software to
> create dng's out of raw files, is this correct?


yes and yes...

This is the fault to Adobe :

- DNG sdk is published using a restricted licence, non-opensource
compatible. Look here :

http://www.adobe.com/support/downloads/dng/dng_sdk.html

- Linux is not supported in this SDK. Of course to have take a look in
source code, this can be fixed without too many problem.

- Abode policy is really strange. Why XMP sdk is published with BSD license
and support Linux as well, and not DNG sdk (:=(((

- Only DNG specification are published over the world.

In the pass, i have work on a patch for libkdcraw to convert RAW to DNG...
in linear mode. This is bad way. There is 2 DNG storing image data :

1/ RAW linear uncompressed (obsolete)
2/ JPEG LossLess with 16 bits color depth support (hightly recommended in
DNG spec)

The first one can be done easily under digiKam, but size file are very huge
(~2 or ~3x original RAW file size). This is a non-sense to use it...

The second one is the right way. File size are divided by 2. Problem :
algorithm used by Adobe is strongly (c) and certainly covered by patents
(i'm not sure about this point)

If you take a look over algorithm, it's an extended version of the old
libjpeg for Linux ! Thanks to adobe to use opensource code and to make
non-opensource implementations...

Another point is about OpenRaw stuff : It's a web site dedicated to promote
DNG format as well... But DNG sdk is not open source compliant... This is
why i will never support OpenRaw...

http://www.openraw.org/

It's certainly time to start a petition against Adobe SDK licencing...

Best

Gilles Caulier
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