wrjpgcom man page on DigitalUNIX

Man page or keyword search:  
man Server   12896 pages
apropos Keyword Search (all sections)
Output format
DigitalUNIX logo
[printable version]

WRJPGCOM(1)							   WRJPGCOM(1)

       wrjpgcom - insert text comments into a JPEG file

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

       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.

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

	      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 com‐
       ments 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	 some‐
       where  else.)  You can enter multiple lines, up to 64KB worth.  Type an
       end-of-file indicator (usually control-D) to terminate the comment text

       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.

       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

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

       Independent JPEG Group

				 15 June 1995			   WRJPGCOM(1)

List of man pages available for DigitalUNIX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net