jpegexiforient1

Usage

Overview

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         | right side
  3   | bottom      | right 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.