1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> 2 <html> 3 <head> 4 <!-- 5 Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. 6 DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 7 8 This code is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License version 2 only, as 10 published by the Free Software Foundation. Oracle designates this 11 particular file as subject to the "Classpath" exception as provided 12 by Oracle in the LICENSE file that accompanied this code. 13 14 This code is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 version 2 for more details (a copy is included in the LICENSE file that 18 accompanied this code). 19 20 You should have received a copy of the GNU General Public License version 21 2 along with this work; if not, write to the Free Software Foundation, 22 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 23 24 Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 25 or visit www.oracle.com if you need additional information or have any 26 questions. 27 --> 28 29 <title>PNG Metadata Format Specification</title> 30 </head> 31 32 <body bgcolor="white"> 33 34 <center><h1> 35 PNG Metadata Format Specification 36 </h1></center> 37 38 <p> 39 40 The PNG native format encodes the complete contents of a PNG file 41 chunk by chunk, except for the IDAT chunks that contain the actual 42 image data. Chunks that are not defined in the PNG 1.2 specification 43 are stored under the <code>UnknownChunks</code> element. Note that it 44 is the responsibility of application software to implement the rules 45 for PNG readers, writers, and editors (<i>e.g.</i>, the rules 46 concerning unsafe-to-copy chunks) described in the PNG specification. 47 The Image I/O library is not, in and of itself, a PNG reader, writer, 48 or editor in the sense of the specification. Rather, it is a tool 49 that may be used to build PNG readers, writers, and editors. 50 51 <p> 52 53 The image's actual width, height, bit depth, and color type will 54 override any values passed to the writer via metadata, with one 55 exception. If the image has an <code>IndexColorModel</code>, the 56 color table entries will be checked to determine if they form a | 1 <!doctype html> 2 <html lang="en"> 3 <head> 4 <meta charset="utf-8"/> 5 <title>PNG Metadata Format Specification</title> 6 </head> 7 <!-- 8 Copyright (c) 2000, 2017, 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 34 <h1>PNG Metadata Format Specification</h1> 35 36 <p> 37 38 The PNG native format encodes the complete contents of a PNG file 39 chunk by chunk, except for the IDAT chunks that contain the actual 40 image data. Chunks that are not defined in the PNG 1.2 specification 41 are stored under the <code>UnknownChunks</code> element. Note that it 42 is the responsibility of application software to implement the rules 43 for PNG readers, writers, and editors (<i>e.g.</i>, the rules 44 concerning unsafe-to-copy chunks) described in the PNG specification. 45 The Image I/O library is not, in and of itself, a PNG reader, writer, 46 or editor in the sense of the specification. Rather, it is a tool 47 that may be used to build PNG readers, writers, and editors. 48 49 <p> 50 51 The image's actual width, height, bit depth, and color type will 52 override any values passed to the writer via metadata, with one 53 exception. If the image has an <code>IndexColorModel</code>, the 54 color table entries will be checked to determine if they form a |