'\" te
.TH rdjpgcom 1 "26 Mar 2004" "SunOS 5.11" "User Commands"
.SH "NAME"
rdjpgcom \- display
text comments from a JPEG file
.SH "SYNOPSIS"
.PP
\fBrdjpgcom\fR [-\fBverbose\fR] [\fB\fIfilename\fR\fR]
.SH "DESCRIPTION"
.PP
\fBrdjpgcom\fR 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\&.
.PP
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\&.
.SH "OPTIONS"
.PP
The following options are supported:
.sp
.ne 2
.mk
\fB-\fBverbose\fR\fR
.in +16n
.rt
Causes \fBrdjpgcom\fR
to also display the JPEG image dimensions\&.
.sp
.sp 1
.in -16n
.SH "OPERANDS"
.PP
The following operands are supported:
.sp
.ne 2
.mk
\fB\fB\fIfilename\fR\fR\fR
.in +16n
.rt
The name of the JPEG file that contains text comments\&.
.sp
.sp 1
.in -16n
.SH "EXTENDED DESCRIPTION"
.PP
\fBrdjpgcom\fR does not depend on the IJG JPEG library\&. The \fBrdjpgcom\fR
source code is intended to illustrate the minimum amount of code required
to parse a JPEG file header correctly\&. 
.PP
In -\fBverbose\fR mode, \fBrdjpgcom\fR also attempts
to display the contents of any "APP12" markers as text\&. Some digital cameras
produce APP12 markers that contain useful textual information\&. You can also
modify the source code to display other APP\fIn\fR
marker types\&.
.SH "ATTRIBUTES"
.PP
See \fBattributes\fR(5)
for descriptions of the following attributes:
.sp
.TS
tab() allbox;
cw(2.750000i)| cw(2.750000i)
lw(2.750000i)| lw(2.750000i).
ATTRIBUTE TYPEATTRIBUTE VALUE
Availabilityimage/library/libjpeg
Interface stabilityVolatile
.TE
.sp
.SH "SEE ALSO"
.PP
\fBcjpeg\fR(1), \fBdjpeg\fR(1), \fBjpegtran\fR(1), \fBwrjpgcom\fR(1)
.SH "NOTES"
.PP
This man page was originally written by the Independent JPEG Group\&.
Updated by Breda McColgan, Sun Microsystems Inc\&., 2004\&. 
...\" created by instant / solbook-to-man, Thu 20 Mar 2014, 02:30
...\" LSARC 2005/734 GNOME For Nevada
...\" LSARC 2003/085 libtiff, libjpeg, and libpng