[Digikam-devel] [Bug 117115] Automatically rotate/flip using camera-provided information (EXIF) modifies image contents

[Matthias Wieser]

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http://bugs.kde.org/show_bug.cgi?id=117115         




------- Additional Comments From mwieser gmx de  2006-05-16 17:36 -------
About lossles vs. not lossless:

Lossless rotation is lossless in a way that there is no recompression.
But the resulting image looks (very!!) slightly different to a image rotated within an image viewer. Calculating the difference between both is *not* the right thing to do! You should rotate the auto-rotated image by 270 degrees (e.g. with jpegtran, which is lossless) and compare the result with the not-rotated version. There will be no difference.

=> Digikam's autorotation makes the image slightly different to the non-rotated (original) version but neither version is better (or worse) than the other. That's just an effect of the Jpeg color subsampling and things like that.

So please do not remove this feature!