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.