JPEGEXIFORIENT(1) User Commands JPEGEXIFORIENT(1)

jpegexiforient - reads or writes the Exif Orientation Tag

jpegexiforient [switches] jpegfile


This is a utility program to get and set the Exif Orientation Tag.
It can be used together with jpegtran in scripts for automatic
orientation correction of digital camera pictures.


The Exif orientation value gives the orientation of the camera
relative to the scene when the image was captured. The relation
of the '0th row' and '0th column' to visual position is shown as
below.


Value | 0th Row | 0th Column
------+-------------+-----------
1 | top | left side
2 | top | rigth side
3 | bottom | rigth side
4 | bottom | left side
5 | left side | top
6 | right side | top
7 | right side | bottom
8 | left side | bottom


For convenience, here is what the letter F would look like if it were
tagged correctly and displayed by a program that ignores the orientation
tag:


1 2 3 4


888888 888888 88 88
88 88 88 88
8888 8888 8888 8888
88 88 88 88
88 88 888888 888888


5 6 7 8


8888888888 88 88 8888888888
88 88 88 88 88 88 88 88
88 8888888888 8888888888 88

jpegexiforient output the Exif Orientation Tag in a JPEG Exif file. With the options -1 .. -8, it can also be used to set the tag.

display this help and exit
output version information and exit
Do not output the trailing newline
-1 .. -8
Set orientation value 1 .. 8


Guido Vollbeding <guido@jpegclub.org>

jpegtran(1), exifautotran(1)

February 2005 jpegexiforient