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User Commands rdjpgcom(1)
NAME
rdjpgcom - display text comments from a JPEG file
SYNOPSIS
rdjpgcom [-verbose] [filename]
DESCRIPTION
rdjpgcom reads the named JPEG or JFIF file, or the standard
input if no file is named, and displays any text comments
found in the file on the standard output.
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.
OPTIONS
The following options are supported:
-verbose Causes rdjpgcom to also display the JPEG
image dimensions.
OPERANDS
The following operands are supported:
filename The name of the JPEG file that contains text
comments.
EXTENDED DESCRIPTION
rdjpgcom does not depend on the IJG JPEG library. The
rdjpgcom source code is intended to illustrate the minimum
amount of code required to parse a JPEG file header
correctly.
In -verbose mode, rdjpgcom also attempts to display the con-
tents of any "APP12" markers as text. Some digital cameras
produce APP12 markers that contain useful textual informa-
tion. You can also modify the source code to display other
APPn marker types.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 26 Mar 2004 1
User Commands rdjpgcom(1)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWjpg |
|_____________________________|_____________________________|
| Interface stability | External |
|_____________________________|_____________________________|
SEE ALSO
cjpeg(1), djpeg(1), jpegtran(1), 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 2
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 11:25:19 GMT 2007
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