[Digikam-devel] [Bug 205776] "Embedded preview loads full image size" does not only do what it says, confusing users

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=205776


Gilles Caulier <caulier.gilles at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lexa at lexa.ru




--- Comment #14 from Gilles Caulier <caulier gilles gmail com>  2009-09-01 12:34:07 ---
Matti,

Yes, RAW preview image is stored Exif, but in proprietary makernote tags. This
is not a standardized place.

2 way can be done to extrcat preview :

1/ libraw, as you can see with dcraw command line tool
2/ exiv2, but you need to parse file type to get right makernote tag.

Way 1/ is the most simple to do because libraw will analyze Raw format for you
automatically. This is the current way used in digiKam ,thrue libkdcraw
interface :

http://websvn.kde.org/trunk/KDE/kdegraphics/libs/libkdcraw/

You will find last libraw code here... 

Currently, libkdcraw extract preview to emulate dcraw -e option :

http://lxr.kde.org/source/KDE/kdegraphics/libs/libkdcraw/libkdcraw/kdcraw.cpp#99

But i'm not sure if libraw API is able to select a specific preview image if
more that one is available. Perhaps Alex can guide us here...

Gilles Caulier

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