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OpenSolaris 2009.06 - man page for rdjpgcom (opensolaris section 1)

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rdjpgcom(1)				  User Commands 			      rdjpgcom(1)

NAME
       rdjpgcom - display text comments from a JPEG file

SYNOPSIS
       rdjpgcom [-verbose] [filename]

DESCRIPTION
       rdjpgcom reads the named JPEG or JFIF file, or the standard input if no file is named, and
       displays 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  does  not  actually  define the intended function of COM blocks, they are widely
       used to hold user-supplied text strings. This enables  you  to  add  annotations,  titles,
       index  terms, and so on to your JPEG files, and later retrieve the COM blocks 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 many COM blocks in one JPEG file.

OPTIONS
       The following options are supported:

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

OPERANDS
       The following operands are supported:

       filename        The name of the JPEG file that contains text comments.

EXTENDED DESCRIPTION
       rdjpgcom  does not depend on the IJG JPEG library. The rdjpgcom source code is intended to
       illustrate the minimum amount of code required to parse a JPEG file header correctly.

       In -verbose mode, rdjpgcom also attempts to display the contents of any "APP12" markers as
       text.  Some digital cameras produce APP12 markers that contain useful textual information.
       You can also modify the source code to display other APPn marker types.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWjpg			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

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

NOTES
       This man page was originally written by the Independent	JPEG  Group.   Updated	by  Breda
       McColgan, Sun Microsystems Inc., 2004.

SunOS 5.11				   26 Mar 2004				      rdjpgcom(1)
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