>From the man page:
http://www.die.net/doc/linux/man/man1/exiftran.1.html
exiftran is a command line utility to transform jpeg images ... It can
rotate images automatically by checking the exif orientation tag, it
updates the exif information if needed (image dimension, orientation),
it also rotates the exif thumbnail. It can process multiple images at once.
For example:
exiftran -d input_file.jpg
Dumps all the exif tags to stdout. You might like to feed it through
grep, eg:
exiftran -d input_file.jpg | grep -A1 thumbnail
exiftran -anig input_file.jpg -o output_file.jpg
Sets the exif orientation tag to Top Left without rotating the
picture, and regenerates the jpeg thumbnail.
How some photo-album apps handle the orientation tag:
* gThumb rotates images losslessly without changing the orientation
tag, meaning that orientation-aware programs will display the
photo the wrong way up
* F-Spot is orientation-aware, and changes only the orientation tag
when you manually rotate
* Digikam is also orientation-aware. Enable the setting "Rotate
images/thumbs according to orientation tag"
How does the exif orientation tag work? Have a look at:
http://sylvana.net/jpegcrop/exif_orientation.html
Douglas.
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