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authorJörg Frings-Fürst <debian@jff-webhosting.net>2015-05-01 16:13:57 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2015-05-01 16:13:57 +0200
commit094535c010320967639e8e86f974d878e80baa72 (patch)
treeefc3094b20355dcbeebb2c4ece4fcfc69bffedb5 /jpg/rdjpgcom.1
parentc07d0c2d2f6f7b0eb6e92cc6204bf05037957e82 (diff)
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-.TH RDJPGCOM 1 "02 April 2009"
-.SH NAME
-rdjpgcom \- display text comments from a JPEG file
-.SH SYNOPSIS
-.B rdjpgcom
-[
-.B \-raw
-]
-[
-.B \-verbose
-]
-[
-.I filename
-]
-.LP
-.SH DESCRIPTION
-.LP
-.B 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.
-.PP
-The JPEG standard allows "comment" (COM) blocks to occur within a JPEG file.
-Although the standard doesn't actually 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 interfere 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.
-.SH OPTIONS
-.TP
-.B \-raw
-Normally
-.B rdjpgcom
-escapes non-printable characters in comments, for security reasons.
-This option avoids that.
-.PP
-.B \-verbose
-Causes
-.B rdjpgcom
-to also display the JPEG image dimensions.
-.PP
-Switch names may be abbreviated, and are not case sensitive.
-.SH HINTS
-.B 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 correctly.
-.PP
-In
-.B \-verbose
-mode,
-.B rdjpgcom
-will also attempt to print the contents of any "APP12" markers as text.
-Some digital cameras produce APP12 markers containing useful textual
-information. If you like, you can modify the source code to print
-other APPn marker types as well.
-.SH SEE ALSO
-.BR cjpeg (1),
-.BR djpeg (1),
-.BR jpegtran (1),
-.BR wrjpgcom (1)
-.SH AUTHOR
-Independent JPEG Group