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RedHat 9 (Linux i386) - man page for rdjpgcom (redhat section 1)

RDJPGCOM(1)			     General Commands Manual			      RDJPGCOM(1)

NAME
       rdjpgcom - display text comments from a JPEG file

SYNOPSIS
       rdjpgcom [ -verbose ] [ filename ]

DESCRIPTION
       rdjpgcom  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.

OPTIONS
       -verbose
	      Causes rdjpgcom to also display the JPEG image dimensions.

       Switch names may be abbreviated, and are not case sensitive.

HINTS
       rdjpgcom  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 header correctly.

       In -verbose mode, rdjpgcom will also attempt to print the contents of any "APP12"  markers
       as  text.   Some  digital cameras produce APP12 markers containing useful textual informa-
       tion.  If you like, you can modify the source code to print other  APPn	marker	types  as
       well.

SEE ALSO
       cjpeg(1), djpeg(1), jpegtran(1), wrjpgcom(1)

AUTHOR
       Independent JPEG Group

					 11 October 1997			      RDJPGCOM(1)


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