wrjpgcom man page on MirBSD

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WRJPGCOM(1)	    UNIX Programmer's Manual	      WRJPGCOM(1)

NAME
     wrjpgcom - insert text comments into a JPEG file

SYNOPSIS
     wrjpgcom [ -replace ] [ -comment text ] [ -cfile name ] [
     filename ]

DESCRIPTION
     wrjpgcom reads the named JPEG/JFIF file, or the standard
     input if no file is named, and generates a new JPEG/JFIF
     file on standard output.  A comment block is added to the
     file.

     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.

     wrjpgcom adds a COM block, containing text you provide, to a
     JPEG file. Ordinarily, the COM block is added after any
     existing COM blocks; but you can delete the old COM blocks
     if you wish.

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

     -replace
	  Delete any existing COM blocks from the file.

     -comment text
	  Supply text for new COM block on command line.

     -cfile name
	  Read text for new COM block from named file.

     If you have only one line of comment text to add, you can
     provide it on the command line with -comment. The comment
     text must be surrounded with quotes so that it is treated as
     a single argument.	 Longer comments can be read from a text
     file.

     If you give neither -comment nor -cfile, then wrjpgcom will
     read the comment text from standard input.	 (In this case an
     input image file name MUST be supplied, so that the source
     JPEG file comes from somewhere else.)  You can enter multi-
     ple lines, up to 64KB worth.  Type an end-of-file indicator
     (usually control-D) to terminate the comment text entry.

MirOS BSD #10-current	  15 June 1995				1

WRJPGCOM(1)	    UNIX Programmer's Manual	      WRJPGCOM(1)

     wrjpgcom will not add a COM block if the provided comment
     string is empty.  Therefore -replace -comment "" can be used
     to delete all COM blocks from a file.

EXAMPLES
     Add a short comment to in.jpg, producing out.jpg:

	  wrjpgcom -c "View of my back yard" in.jpg > out.jpg

     Attach a long comment previously stored in comment.txt:

	  wrjpgcom in.jpg < comment.txt > out.jpg

     or equivalently

	  wrjpgcom -cfile comment.txt < in.jpg > out.jpg

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

AUTHOR
     Independent JPEG Group

MirOS BSD #10-current	  15 June 1995				2

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