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wrjpgcom (1)
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  • wrjpgcom (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • 
    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.
         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
    
    
    
    


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