|.TH RDJPGCOM 1 "02 April 2009"
|rdjpgcom \- display text comments from a JPEG file
|reads the named JPEG/JFIF file, or the standard input if no file is named,
|and prints any text comments found in the file on the standard output.
|The JPEG standard allows "comment" (COM) blocks to occur within a JPEG file.
|Although the standard doesn't actually define what COM blocks are for, they
|are widely used to hold user-supplied text strings. This lets you add
|annotations, titles, index terms, etc to your JPEG files, and later retrieve
|them as text. COM blocks do not interfere with the image stored in the JPEG
|file. The maximum size of a COM block is 64K, but you can have as many of
|them as you like in one JPEG file.
|escapes non-printable characters in comments, for security reasons.
|This option avoids that.
|to also display the JPEG image dimensions.
|Switch names may be abbreviated, and are not case sensitive.
|does not depend on the IJG JPEG library. Its source code is intended as an
|illustration of the minimum amount of code required to parse a JPEG file
|will also attempt to print the contents of any "APP12" markers as text.
|Some digital cameras produce APP12 markers containing useful textual
|information. If you like, you can modify the source code to print
|other APPn marker types as well.
|.SH SEE ALSO
|.BR cjpeg (1),
|.BR djpeg (1),
|.BR jpegtran (1),
|.BR wrjpgcom (1)
|Independent JPEG Group