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1995-09-05
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RDJPGCOM(1) RDJPGCOM(1)
NAME
rdjpgcom - display text comments from a JPEG file
SYNOPSIS
rdjpgcom
[
-verbose
] [
filename
]
DESCRIPTION
rdjpgcom
reads the named JPEG/JFIF file, or the standard
input if no file is named, and prints 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 doesn't actu
ally 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 inter
fere 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.
OPTIONS
-verbose
Causes
rdjpgcom
to also display the JPEG image
dimensions.
Switch names may be abbreviated, and are not case sensi
tive.
HINTS
rdjpgcom
does not depend on the IJG JPEG library. Its
source code is intended as an illustration of the minimum
amount of code required to parse a JPEG file header cor
rectly.
SEE
ALSO
cjpeg
(1),
djpeg
(1),
jpegtran
(1),
wrjpgcom
(1)
AUTHOR
Independent JPEG Group
15 June 1995 1