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libjpeg - A library for manipulating JPEG image format files.…  more info»


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 comments can be read from  a  text

       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 multiple
       lines, up to 64KB worth.  Type an end-of-file indicator (usu‐
       ally control-D) to terminate the comment text entry.

       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)
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