[Kde-imaging] [Bug 204437] DNGConverter turns olympus ORF unusable

Alex Tutubalin lexa at lexa.ru
Tue Aug 25 11:19:33 CEST 2009


https://bugs.kde.org/show_bug.cgi?id=204437





--- Comment #35 from Alex Tutubalin <lexa lexa ru>  2009-08-25 11:19:30 ---
Gustavo, the LibRaw's black level (used in Gilles' dng converter) is really
right value for DNG specs. LibRaw linearizes RAW (where appropriate, e.g. Sony
RAWs or PhaseOne ones) on the reading stage, so black level subtraction is the
logical next step in terms of DNG processing model.

The only problem is camera metadata precedence over DNG metadata. This is
'feature' (or logical bug?) of dcraw and all dcraw-derived tools, including
LibRaw. I know about this feature of LibRaw (I've see some problems with DNGs
converted from Canon RAWs) but have choose to keep dcraw compatibility instead
of fixing it.

I'll take closer look into this problem on weekend. May be, there is easy way
to fix it, at least for particular cameras (e.g. Oly)

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