| author | ohair |
| Wed, 26 May 2010 20:28:04 -0700 | |
| changeset 5551 | 327690766109 |
| parent 5506 | 202f599c92aa |
| child 14642 | 4e46ac7771b7 |
| permissions | -rw-r--r-- |
| 2 | 1 |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
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<html> |
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<head> |
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<!-- |
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Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. |
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DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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This code is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License version 2 only, as |
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published by the Free Software Foundation. Oracle designates this |
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particular file as subject to the "Classpath" exception as provided |
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by Oracle in the LICENSE file that accompanied this code. |
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This code is distributed in the hope that it will be useful, but WITHOUT |
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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version 2 for more details (a copy is included in the LICENSE file that |
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accompanied this code). |
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You should have received a copy of the GNU General Public License version |
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2 along with this work; if not, write to the Free Software Foundation, |
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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327690766109
6956202: Fix a few missed rebranding issues, please contact lines etc.
ohair
parents:
5506
diff
changeset
|
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Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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327690766109
6956202: Fix a few missed rebranding issues, please contact lines etc.
ohair
parents:
5506
diff
changeset
|
25 |
or visit www.oracle.com if you need additional information or have any |
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327690766109
6956202: Fix a few missed rebranding issues, please contact lines etc.
ohair
parents:
5506
diff
changeset
|
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questions. |
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--> |
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<title>GIF Metadata Format Specification</title> |
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</head> |
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<body bgcolor="white"> |
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<center><h1> |
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GIF Metadata Format Specification |
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</h1></center> |
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<a name="gif_stream_metadata_format"> |
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<center><h2> |
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GIF Stream Metadata Format Specification |
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</h2></center> |
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</a> |
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<p> |
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The GIF stream metadata format encodes the information stored in the |
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per-file header, namely the file version, logical screen descriptor, |
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and the global color table. |
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<p> |
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The logical screen descriptor describes the overall width and height |
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of an animated file, as well as information about the color resolution |
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(number of bits per pixel) and pixel aspect ratio. |
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<p> |
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The global color table contains a color lookup table that is used for |
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images that do not have their own local color table. |
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<pre> |
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<!DOCTYPE "javax_imageio_gif_stream_1.0" [ |
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<!ELEMENT "javax_imageio_gif_stream_1.0" (Version?, |
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LogicalScreenDescriptor?, GlobalColorTable?)> |
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<!ELEMENT "Version" EMPTY> |
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<!-- The file version, either 87a or 89a --> |
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<!ATTLIST "Version" "value" ("87a" | "89a") #REQUIRED>
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<!-- The version string --> |
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<!ELEMENT "LogicalScreenDescriptor" EMPTY> |
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<!-- The logical screen descriptor, except for the global color table --> |
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<!ATTLIST "LogicalScreenDescriptor" "logicalScreenWidth" #CDATA |
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#REQUIRED> |
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<!-- The width in pixels of the whole picture --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "LogicalScreenDescriptor" "logicalScreenHeight" #CDATA |
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#REQUIRED> |
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<!-- The height in pixels of the whole picture --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "LogicalScreenDescriptor" "colorResolution" #CDATA |
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#REQUIRED> |
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<!-- The number of bits of color resolution, beteen 1 and 8 --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 8 (inclusive) --> |
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<!ATTLIST "LogicalScreenDescriptor" "pixelAspectRatio" #CDATA |
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#REQUIRED> |
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<!-- If 0, indicates square pixels, else W/H = (value + 16)/64 --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ELEMENT "GlobalColorTable" (ColorTableEntry)*> |
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<!-- The global color table --> |
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<!-- Min children: 2 --> |
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<!-- Max children: 256 --> |
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<!ATTLIST "GlobalColorTable" "sizeOfGlobalColorTable" ("2" |
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"4" | "8" | "16" | "32" | "64" | "128" | "256") #REQUIRED> |
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<!-- The number of entries in the global color table --> |
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<!ATTLIST "GlobalColorTable" "backgroundColorIndex" #CDATA |
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#REQUIRED> |
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<!-- The index of the color table entry to be used as a background --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "GlobalColorTable" "sortFlag" ("TRUE" | "FALSE")
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#REQUIRED> |
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<!-- True if the global color table is sorted by frequency --> |
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<!ELEMENT "ColorTableEntry" EMPTY> |
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<!-- A global color table entry --> |
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<!ATTLIST "ColorTableEntry" "index" #CDATA #REQUIRED> |
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<!-- The index of the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "red" #CDATA #REQUIRED> |
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<!-- The red value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "green" #CDATA #REQUIRED> |
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<!-- The green value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "blue" #CDATA #REQUIRED> |
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<!-- The blue value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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]> |
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</pre> |
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<a name="gif_image_metadata_format"> |
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<center><h2> |
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GIF Image Metadata Format Specification |
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</h2></center> |
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</a> |
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<p> |
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The GIF image metadata format encodes the image descriptor, local |
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color table, and extension information assciated with a single image |
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within a GIF file, typically a frame of an animation. |
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<p> |
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The image description contains the offset of the frame within the |
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logical screen described in the stream metadata, as well as the width |
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and height of the frame and whether it is used interlaced encoding. |
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<p> |
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The local color table, if present, supersedes the global color table |
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for the frame at hand. |
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<p> |
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The graphic control extension contains information on how the frame is |
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to be incorporated into the animation. The disposal method indicates |
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whether the current frame should remain in place |
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(<code>doNotDispose</code>), be restored to the backgound color as |
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specified in the stream metadata |
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(<code>restoreToBackgroundColor</code>), or be restored to the |
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previous frame contents (<code>restoreToPrevious</code>) prior to |
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displaying the subsequent frame. |
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<p> |
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The user input flag indicates whether the animation should pause for |
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user input before advancing to the next frame. The transparent color |
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flag and index indicate a color index for which pixels of the frame |
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should not be drawn. The delay time indicates how long the frame |
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should be displayed, in hundredths of a second. If the user input |
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flag is set and the delay time is 0, the frame is intended to be |
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advanced only on user input. |
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<pre> |
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<!DOCTYPE "javax_imageio_gif_image_1.0" [ |
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<!ELEMENT "javax_imageio_gif_image_1.0" (ImageDescriptor?, |
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LocalColorTable?, GraphicControlExtension?, PlainTextExtension?, |
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ApplicationExtensions?, CommentExtensions?)> |
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<!ELEMENT "ImageDescriptor" EMPTY> |
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<!-- The image descriptor --> |
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<!ATTLIST "ImageDescriptor" "imageLeftPosition" #CDATA #REQUIRED> |
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<!-- The X offset of the image relative to the screen origin --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "ImageDescriptor" "imageTopPosition" #CDATA #REQUIRED> |
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<!-- The Y offset of the image relative to the screen origin --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "ImageDescriptor" "imageWidth" #CDATA #REQUIRED> |
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<!-- The width of the image --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "ImageDescriptor" "imageHeight" #CDATA #REQUIRED> |
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<!-- The height of the image --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "ImageDescriptor" "interlaceFlag" ("TRUE" | "FALSE")
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#REQUIRED> |
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<!-- True if the image is stored using interlacing --> |
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<!ELEMENT "LocalColorTable" (ColorTableEntry)*> |
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<!-- The local color table --> |
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<!-- Min children: 2 --> |
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<!-- Max children: 256 --> |
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<!ATTLIST "LocalColorTable" "sizeOfLocalColorTable" ("2" |
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"4" | "8" | "16" | "32" | "64" | "128" | "256") #REQUIRED> |
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<!-- The number of entries in the local color table --> |
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<!ATTLIST "LocalColorTable" "sortFlag" ("TRUE" | "FALSE")
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#REQUIRED> |
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<!-- True if the local color table is sorted by frequency --> |
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<!ELEMENT "ColorTableEntry" EMPTY> |
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<!-- A local color table entry --> |
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<!ATTLIST "ColorTableEntry" "index" #CDATA #REQUIRED> |
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<!-- The index of the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "red" #CDATA #REQUIRED> |
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<!-- The red value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "green" #CDATA #REQUIRED> |
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<!-- The green value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "ColorTableEntry" "blue" #CDATA #REQUIRED> |
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<!-- The blue value for the color table entry --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ELEMENT "GraphicControlExtension" EMPTY> |
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<!-- A graphic control extension --> |
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<!ATTLIST "GraphicControlExtension" "disposalMethod" ("none" |
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"doNotDispose" | "restoreToBackgroundColor" | |
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"restoreToPrevious" | "undefinedDisposalMethod4" | |
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"undefinedDisposalMethod5" | "undefinedDisposalMethod6" | |
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"undefinedDisposalMethod7") #REQUIRED> |
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<!-- The disposal method for this frame --> |
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<!ATTLIST "GraphicControlExtension" "userInputFlag" ("TRUE" |
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"FALSE") #REQUIRED> |
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<!-- True if the frame should be advanced based on user input --> |
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<!ATTLIST "GraphicControlExtension" "transparentColorFlag" ( |
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"TRUE" | "FALSE") #REQUIRED> |
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<!-- True if a transparent color exists --> |
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<!ATTLIST "GraphicControlExtension" "delayTime" #CDATA #REQUIRED> |
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<!-- The time to delay between frames, in hundredths of a second --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "GraphicControlExtension" "transparentColorIndex" |
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#CDATA #REQUIRED> |
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<!-- The transparent color, if transparentColorFlag is true --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ELEMENT "PlainTextExtension" EMPTY> |
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<!-- A plain text (text grid) extension --> |
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<!ATTLIST "PlainTextExtension" "textGridLeft" #CDATA #REQUIRED> |
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<!-- The X offset of the text grid --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "textGridTop" #CDATA #REQUIRED> |
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<!-- The Y offset of the text grid --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "textGridWidth" #CDATA #REQUIRED> |
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<!-- The number of columns in the text grid --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "textGridHeight" #CDATA #REQUIRED> |
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<!-- The number of rows in the text grid --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "characterCellWidth" #CDATA |
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#REQUIRED> |
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<!-- The width of a character cell --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "characterCellHeight" #CDATA |
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#REQUIRED> |
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<!-- The height of a character cell --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 1 (inclusive) --> |
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<!-- Max value: 65535 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "textForegroundColor" #CDATA |
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#REQUIRED> |
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<!-- The text foreground color index --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ATTLIST "PlainTextExtension" "textBackgroundColor" #CDATA |
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#REQUIRED> |
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<!-- The text background color index --> |
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<!-- Data type: Integer --> |
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<!-- Min value: 0 (inclusive) --> |
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<!-- Max value: 255 (inclusive) --> |
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<!ELEMENT "ApplicationExtensions" (ApplicationExtension)*> |
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<!-- A set of application extensions --> |
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<!-- Min children: 1 --> |
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<!-- Max children: 2147483647 --> |
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<!ELEMENT "ApplicationExtension" EMPTY> |
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<!-- An application extension --> |
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<!-- User object: array of byte --> |
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<!-- Min length: 0 --> |
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<!-- Max length: 2147483647 --> |
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<!ATTLIST "ApplicationExtension" "applicationID" #CDATA |
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#REQUIRED> |
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<!-- The application ID --> |
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<!-- Data type: String --> |
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<!ATTLIST "ApplicationExtension" "authenticationCode" #CDATA |
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#REQUIRED> |
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<!-- The authentication code --> |
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<!-- Data type: String --> |
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<!ELEMENT "CommentExtensions" (CommentExtension)*> |
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<!-- A set of comments --> |
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<!-- Min children: 1 --> |
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<!-- Max children: 2147483647 --> |
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<!ELEMENT "CommentExtension" EMPTY> |
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<!-- A comment --> |
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<!ATTLIST "CommentExtension" "value" #CDATA #REQUIRED> |
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<!-- The comment --> |
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<!-- Data type: String --> |
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]> |
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</pre> |
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<p> |
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<a name="mapping"> |
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<center> |
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<table border=1> |
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<caption><b>Mapping of Standard to GIF Native Stream Metadata</b></caption> |
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<tr> |
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<th>Standard Metadata Component</th> |
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<th>GIF Native Stream Metadata Component</th> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@index</td> |
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<td>/GlobalColorTable/ColorTableEntry@index</td> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@red</td> |
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<td>/GlobalColorTable/ColorTableEntry@red</td> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@green</td> |
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<td>/GlobalColorTable/ColorTableEntry@green</td> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@blue</td> |
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<td>/GlobalColorTable/ColorTableEntry@blue</td> |
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</tr> |
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<tr> |
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<td>/Chroma/BackgroundIndex@value</td> |
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<td>/GlobalColorTable@backgroundColorIndex</td> |
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</tr> |
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<tr> |
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<td>/Data/BitsPerSample@value</td> |
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<td>/LogicalScreenDescriptor@colorResolution</td> |
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</tr> |
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<tr> |
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<td>/Dimension/PixelAspectRatio@value</td> |
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<td>/LogicalScreenDescriptor@pixelAspectRatio</td> |
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</tr> |
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<tr> |
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<td>/Dimension/HorizontalScreenSize@value</td> |
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<td>/LogicalScreenDescriptor@logicalScreenWidth</td> |
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</tr> |
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<tr> |
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<td>/Dimension/VerticalScreenSize@value</td> |
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<td>/LogicalScreenDescriptor@logicalScreenHeight</td> |
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</tr> |
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<tr> |
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<td>/Document/FormatVersion@value</td> |
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<td>/Version@value</td> |
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</tr> |
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</table> |
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</center> |
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</p> |
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<p> |
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<center> |
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<table border=1> |
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<caption><b>Mapping of Standard to GIF Native Image Metadata</b></caption> |
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<tr> |
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<th>Standard Metadata Component</th> |
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<th>GIF Native Image Metadata Component</th> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@index</td> |
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<td>/LocalColorTable/ColorTableEntry@index</td> |
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</tr> |
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<tr> |
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<td>/Chroma/Palette/PaletteEntry@red</td> |
|
421 |
<td>/LocalColorTable/ColorTableEntry@red</td> |
|
422 |
</tr> |
|
423 |
<tr> |
|
424 |
<td>/Chroma/Palette/PaletteEntry@green</td> |
|
425 |
<td>/LocalColorTable/ColorTableEntry@green</td> |
|
426 |
</tr> |
|
427 |
<tr> |
|
428 |
<td>/Chroma/Palette/PaletteEntry@blue</td> |
|
429 |
<td>/LocalColorTable/ColorTableEntry@blue</td> |
|
430 |
</tr> |
|
431 |
<tr> |
|
432 |
<td>/Dimension/HorizontalPixelOffset@value</td> |
|
433 |
<td>/ImageDescriptor@imageLeftPosition</td> |
|
434 |
</tr> |
|
435 |
<tr> |
|
436 |
<td>/Dimension/VerticalPixelOffset@value</td> |
|
437 |
<td>/ImageDescriptor@imageTopPosition</td> |
|
438 |
</tr> |
|
439 |
<tr> |
|
440 |
<td>/Text/TextEntry@value</td> |
|
441 |
<td>/CommentExtensions/CommentExtension@value</td> |
|
442 |
</tr> |
|
443 |
<tr> |
|
444 |
<td>/Transparency/TransparentIndex@value</td> |
|
445 |
<td>/GraphicControlExtension@transparentColorIndex |
|
446 |
(/GraphicControlExtension@transparentColorFlag is also set to |
|
447 |
"TRUE")</td> |
|
448 |
</tr> |
|
449 |
</table> |
|
450 |
</center> |
|
451 |
||
452 |
</body> |
|
453 |
</html> |