Frank wrote:
Using GIMP to rotate JPEG images is actually a bad idea since GIMP
would have to recompress the file, introducing a quality loss. There
are tools that allow to losslessly rotate JPEG images, even
automatically provided that your camera has an orientation sensor and
adds that info the image's EXIF data. jpegtran and exiftran are such

IIRC, gimp knows lossless rotation since version 2.0. I had to use it often and avoided gimp prior to this version. You may realize the speed with which gimp rotates ... reencoding has gone :)

Recoding happens when the image is saved....


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