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1 | .TH RDJPGCOM 1 "02 April 2009" | ||
2 | .SH NAME | ||
3 | rdjpgcom \- display text comments from a JPEG file | ||
4 | .SH SYNOPSIS | ||
5 | .B rdjpgcom | ||
6 | [ | ||
7 | .B \-raw | ||
8 | ] | ||
9 | [ | ||
10 | .B \-verbose | ||
11 | ] | ||
12 | [ | ||
13 | .I filename | ||
14 | ] | ||
15 | .LP | ||
16 | .SH DESCRIPTION | ||
17 | .LP | ||
18 | .B rdjpgcom | ||
19 | reads the named JPEG/JFIF file, or the standard input if no file is named, | ||
20 | and prints any text comments found in the file on the standard output. | ||
21 | .PP | ||
22 | The JPEG standard allows "comment" (COM) blocks to occur within a JPEG file. | ||
23 | Although the standard doesn't actually define what COM blocks are for, they | ||
24 | are widely used to hold user-supplied text strings. This lets you add | ||
25 | annotations, titles, index terms, etc to your JPEG files, and later retrieve | ||
26 | them as text. COM blocks do not interfere with the image stored in the JPEG | ||
27 | file. The maximum size of a COM block is 64K, but you can have as many of | ||
28 | them as you like in one JPEG file. | ||
29 | .SH OPTIONS | ||
30 | .TP | ||
31 | .B \-raw | ||
32 | Normally | ||
33 | .B rdjpgcom | ||
34 | escapes non-printable characters in comments, for security reasons. | ||
35 | This option avoids that. | ||
36 | .PP | ||
37 | .B \-verbose | ||
38 | Causes | ||
39 | .B rdjpgcom | ||
40 | to also display the JPEG image dimensions. | ||
41 | .PP | ||
42 | Switch names may be abbreviated, and are not case sensitive. | ||
43 | .SH HINTS | ||
44 | .B rdjpgcom | ||
45 | does not depend on the IJG JPEG library. Its source code is intended as an | ||
46 | illustration of the minimum amount of code required to parse a JPEG file | ||
47 | header correctly. | ||
48 | .PP | ||
49 | In | ||
50 | .B \-verbose | ||
51 | mode, | ||
52 | .B rdjpgcom | ||
53 | will also attempt to print the contents of any "APP12" markers as text. | ||
54 | Some digital cameras produce APP12 markers containing useful textual | ||
55 | information. If you like, you can modify the source code to print | ||
56 | other APPn marker types as well. | ||
57 | .SH SEE ALSO | ||
58 | .BR cjpeg (1), | ||
59 | .BR djpeg (1), | ||
60 | .BR jpegtran (1), | ||
61 | .BR wrjpgcom (1) | ||
62 | .SH AUTHOR | ||
63 | Independent JPEG Group | ||