<br><br><div><span class="gmail_quote">2008/2/5, Markus Spring <<a href="mailto:m.spring@gmx.de">m.spring@gmx.de</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
-----BEGIN PGP SIGNED MESSAGE-----<br>Hash: SHA1<br><br>Gerhard Kulzer wrote:<br>| if you're tagging your whole collection you might be interested in reading this:<br>| <a href="http://wiki.kde.org/tiki-index.php?page=DigikamDAM">http://wiki.kde.org/tiki-index.php?page=DigikamDAM</a><br>
Gerhard, this is an excellent article! Thank you for this compilation.<br><br>One question regarding dng: As far as I know there is no linux software to<br>create dng's out of raw files, is this correct?</blockquote><div>
<br>yes and yes...<br><br>This is the fault to Adobe :<br><br>- DNG sdk is published using a restricted licence, non-opensource compatible. Look here :<br><br><a href="http://www.adobe.com/support/downloads/dng/dng_sdk.html">http://www.adobe.com/support/downloads/dng/dng_sdk.html</a><br>
<br>- 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.<br><br>- Abode policy is really strange. Why XMP sdk is published with BSD license and support Linux as well, and not DNG sdk (:=(((<br>
<br>- Only DNG specification are published over the world.<br><br>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 : <br><br>1/ RAW linear uncompressed (obsolete)<br>
2/ JPEG LossLess with 16 bits color depth support (hightly recommended in DNG spec)<br><br>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...<br>
<br>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)<br><br>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... <br>
<br>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...<br><br><a href="http://www.openraw.org/">http://www.openraw.org/</a><br>
<br>It's certainly time to start a petition against Adobe SDK licencing...<br><br>Best <br><br>Gilles Caulier</div></div><br>