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.TH JPEGEXIFORIENT "1" "February 2005" "jpegexiforient" "User Commands"
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jpegexiforient \- reads or writes the Exif Orientation Tag
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[\fIswitches\fR] \fIjpegfile\fR
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This is a utility program to get and set the Exif Orientation Tag.
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It can be used together with jpegtran in scripts for automatic
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orientation correction of digital camera pictures.
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The Exif orientation value gives the orientation of the camera
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relative to the scene when the image was captured. The relation
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of the '0th row' and '0th column' to visual position is shown as
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Value | 0th Row | 0th Column
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------+-------------+-----------
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3 | bottom | right side
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4 | bottom | left side
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7 | right side | bottom
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8 | left side | bottom
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For convenience, here is what the letter F would look like if it were
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tagged correctly and displayed by a program that ignores the orientation
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8888888888 88 88 8888888888
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88 88 88 88 88 88 88 88
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88 8888888888 8888888888 88
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jpegexiforient output the Exif Orientation Tag in a JPEG Exif file.
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With the options -1 .. -8, it can also be used to set the tag.
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display this help and exit
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output version information and exit
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Do not output the trailing newline
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\fB\-1\fR .. \fB\-8\fR
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Set orientation value 1 .. 8
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Guido Vollbeding <guido@jpegclub.org>