WRJPGCOM

WRJPGCOM

NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES SEE ALSO AUTHOR

NAME

wrjpgcom - insert text comments into a JPEG file

SYNOPSIS

wrjpgcom [ __-replace__ [unrenderable node] [ __-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