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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 |
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Chromium Code Reviews
Issue 1953443002:
Update to libjpeg_turbo 1.4.90 (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@master