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User Commands 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 or JFIF file, or the standard
input if no file is named, and generates a new JPEG or JFIF
file on the 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 does not actually
define the intended function of COM blocks, they are widely
used to hold user-supplied text strings. This enables you to
add annotations, titles, index terms, and so on to your JPEG
files, and later retrieve the COM blocks 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 many
COM blocks in one JPEG file.
wrjpgcom adds a COM block, containing text that 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
The following options are supported:
-cfile name Read the text for a new COM block from the
named file.
-comment text Supply the text for a new COM block on the
command line.
-replace Delete any existing COM blocks from the
file.
OPERANDS
The following operands are supported:
filename The name of the JPEG file to which you want
to add text comments.
SunOS 5.10 Last change: 26 Mar 2004 1
User Commands wrjpgcom(1)
EXTENDED DESCRIPTION
To add only one line of comment text, use the -comment
option to provide the text on the command line. Specify the
comment text within quotes, so that the text is treated as a
single argument. Longer comments can be read from a text
file.
If you specify neither the -comment nor the -cfile option,
wrjpgcom reads the comment text from standard input. In such
cases, you must supply an input image filename. You can
enter multiple lines, up to 64KB. Type an end-of-file indi-
cator, usually Ctrl-D, to terminate the comment text entry.
wrjpgcom does not add a COM block if the provided comment
string is empty. Therefore, you can use -replace -comment ""
to delete all COM blocks from a file.
EXAMPLES
Example 1: Adding a Short Comment to in.jpg to Produce
out.jpg
example% wrjpgcom -c "View of my back yard" in.jpg > out.jpg
Example 2: Attaching a Long Comment Previously Stored in
comment.txt
example% wrjpgcom in.jpg < comment.txt > out.jpg
or
example% wrjpgcom -cfile comment.txt < in.jpg > out.jpg
In this example, 1000 is a number that is larger than the
number of rows in the source file.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWjpg |
|_____________________________|_____________________________|
| Interface stability | External |
|_____________________________|_____________________________|
SEE ALSO
cjpeg(1), djpeg(1), jpegtran(1), rdjpgcom(1)
SunOS 5.10 Last change: 26 Mar 2004 2
User Commands wrjpgcom(1)
NOTES
This man page was originally written by the Independent JPEG
Group. Updated by Breda McColgan, Sun Microsystems Inc.,
2004.
SunOS 5.10 Last change: 26 Mar 2004 3
Man(1) output converted with
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This page was generated on Wed Sep 12 11:25:40 GMT 2007
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