wrjpgcom(1) - phpMan

WRJPGCOM(1)                                                                           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 multiple  lines,  up  to  64KB
       worth.   Type  an  end-of-file indicator (usually 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.

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



                                           15 June 1995                               WRJPGCOM(1)

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