https://bugs.kde.org/show_bug.cgi?id=441698
Martin Kyral <sine.nom...@centrum.cz> changed:
What |Removed |Added
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CC| |sine.nom...@centrum.cz
--- Comment #48 from Martin Kyral <sine.nom...@centrum.cz> ---
(In reply to Maximilian Schmeling from comment #34)
> According to this site: http://lclevy.free.fr/nef/
> The Nikon Electronic File format (NEF) also stores an (approximately)
> 160x120 preview thumbnail (uncompressed TIFF).
> Gwenview might choose the thumbnail instead of the raw image.
> This would also explain the duplicate attributes, one for the real raw image
> and the other for the thumbnail.
Well, there are acutally two jpeg previews in each and every RAW file: 160x120
and full-res or reduced-but-high-enough. What's the former one purpose, I don't
know. The latter one is there so you can review the image on the back of the
camera whle not draining the battery for demosaicing. dcraw -e abdc.raw gives
you the preview. Gwenview uses libraw to extract the high-res jpeg preview and
feed it into the jpeg pipeline. I know that, because I implemented the feature
back in 2013. Unfortunatelly, I kind of fell out of the process and haven't
written a line in C++ since then so I am not sure I can fix the breakage which
I discovered right now. What a mess...
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