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 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.

OPTIONS

-verbose
    Causes rdjpgcom to also display the JPEG image dimensions.

Switch names may be abbreviated, and are not case sensitive.

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 correctly.

SEE ALSO
cjpeg(1), djpeg(1), wrjpgcom(1)

AUTHOR
Independent JPEG Group