exiftran - transform digital camera jpeg images

exiftran [ options ] file(s)

exiftran is a command line utility to transform digital image jpeg images. It can do lossless rotations like jpegtran, but unlike jpegtran it cares about the EXIF data: It can rotate images automatically by checking the exif orientation tag, it updates the exif informaton if needed (image dimension, orientation), it also rotates the exif thumbnail. It can process multiple images at once.

-a

automatic (using exif orientation tag)

-9

rotate by 90 degrees

-1

rotate by 180 degrees

-2

rotate by 270 degrees

-f

flip vertical

-F

flip horizontal

-t

transpose

-T

transverse

-nt

Don't rotate exif thumbnail.

-ni

Don't rotate jpeg image. You might need this or or the -nt option to fixup things in case you rotated the image with some utility which ignores the exif thumbnail. Just generating a new thumbnail with -g is another way to fix it.

-no

Don't update the orientation tag. By default exiftran sets the orientation to "1" (no transformation needed) to avoid other exif-aware applications try to rotate the already-rotated image again.

-h

print a short help text

-d

Dump exif data for the file(s).

-c <text>

Set jpeg comment tag to <text>.

-g

(re)generate EXIF thumbnail.

-o <file>

Specify output file. Only one input file is allowed in this mode.

-i

Enable inplace editing of the images. Exiftran allows multiple input files then. You must specify either this option or a output file with -o for all operations which modify the image (i.e. everything but -d right now).

-b

Create a backup file when doing inplace editing.

-p

Preserve timestamps (atime + mtime) when doing inplace editing.

Autorotate all jpeg files in the current directory:

   exiftran -ai *.jpeg

jpegtran(1), exif(1)

Gerd Knorr <kraxel@bytesex.org>

Copyright (C) 2002 Gerd Knorr <kraxel@bytesex.org>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.