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WRJPGCOM
!!!WRJPGCOM
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO
AUTHOR
----
!!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


__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__ ''
'' ____ ''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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Last edited on Tuesday, June 4, 2002 12:23:01 am by "perry"

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