CentOS 7.0 - man page for rdjpgcom (centos section 1)

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RDJPGCOM(1)									      RDJPGCOM(1)

       rdjpgcom - display text comments from a JPEG file

       rdjpgcom [ -raw ] [ -verbose ] [ filename ]

       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.

       -raw   Normally	rdjpgcom  escapes non-printable characters in comments, for security rea-
	      sons.  This option avoids that.

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

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

       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

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

       Independent JPEG Group

					  02 April 2009 			      RDJPGCOM(1)
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