1 <!doctype html>
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5 <title>JPEG Metadata Format Specification and Usage Notes</title>
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8 Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
9 DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11 This code is free software; you can redistribute it and/or modify it
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15 by Oracle in the LICENSE file that accompanied this code.
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17 This code is distributed in the hope that it will be useful, but WITHOUT
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21 accompanied this code).
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23 You should have received a copy of the GNU General Public License version
24 2 along with this work; if not, write to the Free Software Foundation,
25 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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28 or visit www.oracle.com if you need additional information or have any
29 questions.
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31
32 <body>
33 <main role="main">
34 <h1>JPEG Metadata Format Specification and Usage Notes</h1>
35
36 <p>
37 <a href=#metadata>JPEG Metadata</a><br>
38 <a href=#abbrev>Abbreviated Streams</a><br>
39 <a href=#tables>Sources of Tables</a><br>
40 <a href=#color>Colorspace Transformations and Conventional Markers</a><br>
41 <a href=#thumbs>Thumbnail Images</a><br>
42 <a href=#prog>Progressive Encoding</a><br>
43 <a href=#tree>Native Metadata Format Tree Structure and Editing</a><br>
44 <a href=#image>Image Metadata DTD</a><br>
45 <a href=#stream>Stream Metadata DTD</a>
46 <p>
47 <b>NOTE</b>: It is important to call <code>dispose()</code>
48 on the JPEG reader and writer objects when they are no longer needed, as
49 they consume significant native resources which are not adequately recovered
50 by garbage collection. Both reader and writer call <code>dispose()</code>
51 in their finalizers, but those finalizers may not be called before the native
52 code has exhausted native memory.
53
1142 "3") #REQUIRED>
1143 <!-- The huffman table to use for encoding AC coefficients -->
1144 ]>
1145 </pre>
1146
1147 <h2>
1148 <a id=stream>Stream Metadata DTD</a>
1149 </h2>
1150
1151 <pre>
1152 <!DOCTYPE "javax_imageio_jpeg_stream_1.0" [
1153 <!ELEMENT "javax_imageio_jpeg_stream_1.0" (dqt |
1154 dht |
1155 dri |
1156 com |
1157 unknown)*>
1158
1159 <!-- All elements are as defined above for image metadata -->
1160 ]>
1161 </pre>
1162 </main>
1163 </body>
1164 </html>
|
1 <!doctype html>
2 <html lang="en">
3 <head>
4 <meta charset="utf-8"/>
5 <title>JPEG Metadata Format Specification and Usage Notes</title>
6 </head>
7 <!--
8 Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
9 DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
10
11 This code is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License version 2 only, as
13 published by the Free Software Foundation. Oracle designates this
14 particular file as subject to the "Classpath" exception as provided
15 by Oracle in the LICENSE file that accompanied this code.
16
17 This code is distributed in the hope that it will be useful, but WITHOUT
18 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 version 2 for more details (a copy is included in the LICENSE file that
21 accompanied this code).
22
23 You should have received a copy of the GNU General Public License version
24 2 along with this work; if not, write to the Free Software Foundation,
25 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
26
27 Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
28 or visit www.oracle.com if you need additional information or have any
29 questions.
30 -->
31
32 <body>
33 <main role="main">
34 <div class="contentContainer">
35 <h1>JPEG Metadata Format Specification and Usage Notes</h1>
36
37 <p>
38 <a href=#metadata>JPEG Metadata</a><br>
39 <a href=#abbrev>Abbreviated Streams</a><br>
40 <a href=#tables>Sources of Tables</a><br>
41 <a href=#color>Colorspace Transformations and Conventional Markers</a><br>
42 <a href=#thumbs>Thumbnail Images</a><br>
43 <a href=#prog>Progressive Encoding</a><br>
44 <a href=#tree>Native Metadata Format Tree Structure and Editing</a><br>
45 <a href=#image>Image Metadata DTD</a><br>
46 <a href=#stream>Stream Metadata DTD</a>
47 <p>
48 <b>NOTE</b>: It is important to call <code>dispose()</code>
49 on the JPEG reader and writer objects when they are no longer needed, as
50 they consume significant native resources which are not adequately recovered
51 by garbage collection. Both reader and writer call <code>dispose()</code>
52 in their finalizers, but those finalizers may not be called before the native
53 code has exhausted native memory.
54
1143 "3") #REQUIRED>
1144 <!-- The huffman table to use for encoding AC coefficients -->
1145 ]>
1146 </pre>
1147
1148 <h2>
1149 <a id=stream>Stream Metadata DTD</a>
1150 </h2>
1151
1152 <pre>
1153 <!DOCTYPE "javax_imageio_jpeg_stream_1.0" [
1154 <!ELEMENT "javax_imageio_jpeg_stream_1.0" (dqt |
1155 dht |
1156 dri |
1157 com |
1158 unknown)*>
1159
1160 <!-- All elements are as defined above for image metadata -->
1161 ]>
1162 </pre>
1163 </div>
1164 </main>
1165 </body>
1166 </html>
|