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| |
| <title>PNG Metadata Format Specification</title> |
| </head> |
| |
| <body bgcolor="white"> |
| |
| <center><h1> |
| PNG Metadata Format Specification |
| </h1></center> |
| |
| <p> |
| |
| The PNG native format encodes the complete contents of a PNG file |
| chunk by chunk, except for the IDAT chunks that contain the actual |
| image data. Chunks that are not defined in the PNG 1.2 specification |
| are stored under the <code>UnknownChunks</code> element. Note that it |
| is the responsibility of application software to implement the rules |
| for PNG readers, writers, and editors (<i>e.g.</i>, the rules |
| concerning unsafe-to-copy chunks) described in the PNG specification. |
| The Image I/O library is not, in and of itself, a PNG reader, writer, |
| or editor in the sense of the specification. Rather, it is a tool |
| that may be used to build PNG readers, writers, and editors. |
| |
| <p> |
| |
| The image's actual width, height, bit depth, and color type will |
| override any values passed to the writer via metadata, with one |
| exception. If the image has an <code>IndexColorModel</code>, the |
| color table entries will be checked to determine if they form a |
| uniform grayscale ramp. If so, the image will normally be encoded |
| using as grayscale instead of palette color. However, if the color |
| type set in the metadata is "Palette", palette color will be used. |
| |
| <p> |
| |
| If no metadata is supplied when encoding an image, the header is |
| initialized from the image being encoded, and no optional chunks are |
| included. |
| |
| <p> |
| |
| The semantics of the standard chunks are described in the <A |
| HREF="http://www.libpng.org/pub/png/spec/">PNG specification</A>. |
| Note that there are some restrictions on which chunks may appear |
| for each color type. In particular, |
| |
| <ul> |
| <li>A <code>PLTE</code> chunk may not appear in a <code>Gray</code> |
| or <code>GrayAlpha</code> image |
| |
| <li><code>hIST</code> and <code>tRNS</code> chunks require a prior |
| <code>PLTE</code> chunk |
| |
| <li>A <code>tRNS</code> chunk may not appear in |
| <code>GrayAlpha</code> and <code>RGBA</code> images |
| </ul> |
| |
| The child nodes of the <code>bKGD</code>, <code>sBIT</code>, and |
| <code>tRNS</code> chunks must match the image's color type. |
| |
| <p> |
| |
| Certain chunks may meaningfully appear multiple times in a PNG file, |
| in particular the text-related chunks. In order to simplify the |
| metadata format, multiple instances of these chunks are consolidated |
| under a single parent node (<i>e.g.</i>, the <code>tEXt</code> node), |
| which may have zero or more children (<i>e.g.</i>, |
| <code>tEXtEntry</code> nodes). If no children are present, no chunk |
| will be written. Similarly, unknown chunks are stored as children of |
| a single <code>UnknownChunks</code> node. |
| |
| <p> |
| |
| It is not possible to control the ordering of the chunks as they are |
| written, or to determine the order of the chunks in a file being read. |
| |
| <pre> |
| <!DOCTYPE "javax_imageio_png_1.0" [ |
| |
| <!ELEMENT "javax_imageio_png_1.0" (IHDR?, PLTE?, bKGD?, cHRM?, |
| gAMA?, hIST?, iCCP?, iTXt?, pHYS?, sBIT?, sPLT?, sRGB?, tEXt?, |
| tIME?, tRNS?, zTXt?, UnknownChunks?)> |
| |
| <!ELEMENT "IHDR" EMPTY> |
| <!-- The IHDR chunk, containing the header --> |
| <!ATTLIST "IHDR" "width" #CDATA #REQUIRED> |
| <!-- The width of the image in pixels --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 1 (inclusive) --> |
| <!-- Max value: 2147483647 (inclusive) --> |
| <!ATTLIST "IHDR" "height" #CDATA #REQUIRED> |
| <!-- The height of the image in pixels --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 1 (inclusive) --> |
| <!-- Max value: 2147483647 (inclusive) --> |
| <!ATTLIST "IHDR" "bitDepth" ("1" | "2" | "4" | "8" | "16") |
| #REQUIRED> |
| <!-- The bit depth of the image samples --> |
| <!ATTLIST "IHDR" "colorType" ("Grayscale" | "RGB" | "Palette" | |
| "GrayAlpha" | "RGBAlpha") #REQUIRED> |
| <!-- The color type of the image --> |
| <!ATTLIST "IHDR" "compressionMethod" ("deflate") #REQUIRED> |
| <!-- The compression used for image data, always "deflate" --> |
| <!ATTLIST "IHDR" "filterMethod" ("adaptive") #REQUIRED> |
| <!-- The filtering method used for compression, always "adaptive" --> |
| <!ATTLIST "IHDR" "interlaceMethod" ("none" | "adam7") #REQUIRED> |
| <!-- The interlacing method, "none" or "adam7" --> |
| |
| <!ELEMENT "PLTE" (PLTEEntry)*> |
| <!-- The PLTE chunk, containing the palette --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 256 --> |
| |
| <!ELEMENT "PLTEEntry" EMPTY> |
| <!-- A palette entry --> |
| <!ATTLIST "PLTEEntry" "index" #CDATA #REQUIRED> |
| <!-- The index of a palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "PLTEEntry" "red" #CDATA #REQUIRED> |
| <!-- The red value of a palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "PLTEEntry" "green" #CDATA #REQUIRED> |
| <!-- The green value of a palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "PLTEEntry" "blue" #CDATA #REQUIRED> |
| <!-- The blue value of a palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "bKGD" (bKGD_Grayscale | bKGD_RGB | bKGD_Palette)> |
| <!-- The bKGD chunk, containing the background color --> |
| |
| <!ELEMENT "bKGD_Grayscale" EMPTY> |
| <!-- A grayscale background color, for Gray and GrayAlpha images --> |
| <!ATTLIST "bKGD_Grayscale" "gray" #CDATA #REQUIRED> |
| <!-- A gray value to be used as a background --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "bKGD_RGB" EMPTY> |
| <!-- An RGB background color, for RGB and RGBAlpha images --> |
| <!ATTLIST "bKGD_RGB" "red" #CDATA #REQUIRED> |
| <!-- A red value to be used as a background --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "bKGD_RGB" "green" #CDATA #REQUIRED> |
| <!-- A green value to be used as a background --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "bKGD_RGB" "blue" #CDATA #REQUIRED> |
| <!-- A blue value to be used as a background --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "bKGD_Palette" EMPTY> |
| <!-- A background palette index --> |
| <!ATTLIST "bKGD_Palette" "index" #CDATA #REQUIRED> |
| <!-- A palette index to be used as a background --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "cHRM" EMPTY> |
| <!-- The cHRM chunk, containing color calibration --> |
| <!ATTLIST "cHRM" "whitePointX" #CDATA #REQUIRED> |
| <!-- The CIE x coordinate of the white point, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "whitePointY" #CDATA #REQUIRED> |
| <!-- The CIE y coordinate of the white point, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "redX" #CDATA #REQUIRED> |
| <!-- The CIE x coordinate of the red primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "redY" #CDATA #REQUIRED> |
| <!-- The CIE y coordinate of the red primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "greenX" #CDATA #REQUIRED> |
| <!-- The CIE x coordinate of the green primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "greenY" #CDATA #REQUIRED> |
| <!-- The CIE y coordinate of the green primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "blueX" #CDATA #REQUIRED> |
| <!-- The CIE x coordinate of the blue primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "cHRM" "blueY" #CDATA #REQUIRED> |
| <!-- The CIE y coordinate of the blue primary, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "gAMA" EMPTY> |
| <!-- The gAMA chunk, containing the image gamma --> |
| <!ATTLIST "gAMA" "value" #CDATA #REQUIRED> |
| <!-- The image gamma, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 2147483647 (inclusive) --> |
| |
| <!ELEMENT "hIST" (hISTEntry)*> |
| <!-- The hIST chunk, containing histogram information --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 256 --> |
| |
| <!ELEMENT "hISTEntry" EMPTY> |
| <!-- A histogram entry --> |
| <!ATTLIST "hISTEntry" "index" #CDATA #REQUIRED> |
| <!-- The palette index of this histogram entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "hISTEntry" "value" #CDATA #REQUIRED> |
| <!-- The frequency of this histogram entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "iCCP" EMPTY> |
| <!-- The iCCP chunk, containing an ICC color profile --> |
| <!-- User object: array of byte --> |
| <!-- Min length: 0 --> |
| <!-- Max length: 2147483647 --> |
| <!ATTLIST "iCCP" "profileName" #CDATA #REQUIRED> |
| <!-- The name of this ICC profile --> |
| <!-- Data type: String --> |
| <!ATTLIST "iCCP" "compressionMethod" ("deflate") #REQUIRED> |
| <!-- The compression method used to store this ICC profile --> |
| |
| <!ELEMENT "iTXt" (iTXtEntry)*> |
| <!-- The iTXt chunk, containing internationalized text --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 2147483647 --> |
| |
| <!ELEMENT "iTXtEntry" EMPTY> |
| <!-- A localized text entry --> |
| <!ATTLIST "iTXtEntry" "keyword" #CDATA #REQUIRED> |
| <!-- The keyword --> |
| <!-- Data type: String --> |
| <!ATTLIST "iTXtEntry" "compressionFlag" ("TRUE" | "FALSE") |
| #REQUIRED> |
| <!ATTLIST "iTXtEntry" "compressionMethod" #CDATA #REQUIRED> |
| <!-- The compression method used to store this iTXt entry --> |
| <!-- Data type: String --> |
| <!ATTLIST "iTXtEntry" "languageTag" #CDATA #REQUIRED> |
| <!-- The ISO tag describing the language this iTXt entry --> |
| <!-- Data type: String --> |
| <!ATTLIST "iTXtEntry" "translatedKeyword" #CDATA #REQUIRED> |
| <!-- The translated keyword for iTXt entry --> |
| <!-- Data type: String --> |
| <!ATTLIST "iTXtEntry" "text" #CDATA #REQUIRED> |
| <!-- The localized text --> |
| <!-- Data type: String --> |
| |
| <!ELEMENT "pHYS" EMPTY> |
| <!-- The pHYS chunk, containing the pixel size and aspect ratio --> |
| <!ATTLIST "pHYS" "pixelsPerUnitXAxis" #CDATA #REQUIRED> |
| <!-- The number of horizontal pixels per unit, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 2147483647 (inclusive) --> |
| <!ATTLIST "pHYS" "pixelsPerUnitYAxis" #CDATA #REQUIRED> |
| <!-- The number of vertical pixels per unit, multiplied by 1e5 --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 2147483647 (inclusive) --> |
| <!ATTLIST "pHYS" "unitSpecifier" ("unknown" | "meter") #REQUIRED> |
| <!-- The unit specifier for this chunk (i.e., meters) --> |
| |
| <!ELEMENT "sBIT" (sBIT_Grayscale | sBIT_GrayAlpha | sBIT_RGB | |
| sBIT_RGBAlpha | sBIT_Palette)> |
| <!-- The sBIT chunk, containing significant bit information --> |
| |
| <!ELEMENT "sBIT_Grayscale" EMPTY> |
| <!-- Significant bit information for gray samples --> |
| <!ATTLIST "sBIT_Grayscale" "gray" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the gray samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sBIT_GrayAlpha" EMPTY> |
| <!-- Significant bit information for gray and alpha samples --> |
| <!ATTLIST "sBIT_GrayAlpha" "gray" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the gray samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_GrayAlpha" "alpha" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the alpha samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sBIT_RGB" EMPTY> |
| <!-- Significant bit information for RGB samples --> |
| <!ATTLIST "sBIT_RGB" "red" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the red samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_RGB" "green" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the green samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_RGB" "blue" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the blue samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sBIT_RGBAlpha" EMPTY> |
| <!-- Significant bit information for RGBA samples --> |
| <!ATTLIST "sBIT_RGBAlpha" "red" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the red samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_RGBAlpha" "green" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the green samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_RGBAlpha" "blue" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the blue samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_RGBAlpha" "alpha" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the alpha samples --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sBIT_Palette" EMPTY> |
| <!-- Significant bit information for RGB palette entries --> |
| <!ATTLIST "sBIT_Palette" "red" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the red palette entries --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_Palette" "green" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the green palette entries --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sBIT_Palette" "blue" #CDATA #REQUIRED> |
| <!-- The number of significant bits of the blue palette entries --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sPLT" (sPLTEntry)*> |
| <!-- The sPLT chunk, containing a suggested palette --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 256 --> |
| |
| <!ELEMENT "sPLTEntry" EMPTY> |
| <!-- A suggested palette entry --> |
| <!ATTLIST "sPLTEntry" "index" #CDATA #REQUIRED> |
| <!-- The index of a suggested palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sPLTEntry" "red" #CDATA #REQUIRED> |
| <!-- The red value of a suggested palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sPLTEntry" "green" #CDATA #REQUIRED> |
| <!-- The green value of a suggested palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sPLTEntry" "blue" #CDATA #REQUIRED> |
| <!-- The blue value of a suggested palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "sPLTEntry" "alpha" #CDATA #REQUIRED> |
| <!-- The blue value of a suggested palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "sRGB" EMPTY> |
| <!-- The sRGB chunk, containing rendering intent information --> |
| <!ATTLIST "sRGB" "renderingIntent" ("Perceptual" | |
| "Relative colorimetric" | "Saturation" | |
| "Absolute colorimetric") #REQUIRED> |
| <!-- The rendering intent --> |
| |
| <!ELEMENT "tEXt" (tEXtEntry)*> |
| <!-- The tEXt chunk, containing text --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 2147483647 --> |
| |
| <!ELEMENT "tEXtEntry" EMPTY> |
| <!-- A text entry --> |
| <!ATTLIST "tEXtEntry" "keyword" #CDATA #REQUIRED> |
| <!-- The keyword --> |
| <!-- Data type: String --> |
| <!ATTLIST "tEXtEntry" "value" #CDATA #REQUIRED> |
| <!-- The text --> |
| <!-- Data type: String --> |
| |
| <!ELEMENT "tIME" EMPTY> |
| <!-- The tIME chunk, containing the image modification time --> |
| <!ATTLIST "tIME" "year" #CDATA #REQUIRED> |
| <!-- The year when the image was last modified --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "tIME" "month" #CDATA #REQUIRED> |
| <!-- The month when the image was last modified, 1 = January --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 1 (inclusive) --> |
| <!-- Max value: 12 (inclusive) --> |
| <!ATTLIST "tIME" "day" #CDATA #REQUIRED> |
| <!-- The day of the month when the image was last modified --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 1 (inclusive) --> |
| <!-- Max value: 31 (inclusive) --> |
| <!ATTLIST "tIME" "hour" #CDATA #REQUIRED> |
| <!-- The hour when the image was last modified --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 23 (inclusive) --> |
| <!ATTLIST "tIME" "minute" #CDATA #REQUIRED> |
| <!-- The minute when the image was last modified --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 59 (inclusive) --> |
| <!ATTLIST "tIME" "second" #CDATA #REQUIRED> |
| <!-- The second when the image was last modified, 60 = leap second --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 60 (inclusive) --> |
| |
| <!ELEMENT "tRNS" (tRNS_Grayscale | tRNS_RGB | tRNS_Palette)> |
| <!-- The tRNS chunk, containing transparency information --> |
| |
| <!ELEMENT "tRNS_Grayscale" EMPTY> |
| <!-- A grayscale value that should be considered transparent --> |
| <!ATTLIST "tRNS_Grayscale" "gray" #CDATA #REQUIRED> |
| <!-- The gray value to be considered transparent --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "tRNS_RGB" EMPTY> |
| <!-- An RGB value that should be considered transparent --> |
| <!ATTLIST "tRNS_RGB" "red" #CDATA #REQUIRED> |
| <!-- The red value to be considered transparent --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "tRNS_RGB" "green" #CDATA #REQUIRED> |
| <!-- The green value to be considered transparent --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| <!ATTLIST "tRNS_RGB" "blue" #CDATA #REQUIRED> |
| <!-- The blure value to be considered transparent --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 65535 (inclusive) --> |
| |
| <!ELEMENT "tRNS_Palette" EMPTY> |
| <!-- A palette index that should be considered transparent --> |
| <!ATTLIST "tRNS_Palette" "index" #CDATA #REQUIRED> |
| <!-- A palette index to be considered transparent --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| <!ATTLIST "tRNS_Palette" "alpha" #CDATA #REQUIRED> |
| <!-- The transparency associated with the palette entry --> |
| <!-- Data type: Integer --> |
| <!-- Min value: 0 (inclusive) --> |
| <!-- Max value: 255 (inclusive) --> |
| |
| <!ELEMENT "zTXt" (zTXtEntry)*> |
| <!-- The zTXt chunk, containing compressed text --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 2147483647 --> |
| |
| <!ELEMENT "zTXtEntry" EMPTY> |
| <!-- A compressed text entry --> |
| <!-- User object: array of byte --> |
| <!-- Min length: 0 --> |
| <!-- Max length: 2147483647 --> |
| <!ATTLIST "zTXtEntry" "keyword" #CDATA #REQUIRED> |
| <!-- The keyword --> |
| <!-- Data type: String --> |
| <!ATTLIST "zTXtEntry" "compressionMethod" ("deflate") |
| #REQUIRED> |
| <!-- The compressed text --> |
| |
| <!ELEMENT "UnknownChunks" (UnknownChunk)*> |
| <!-- A set of unknown chunks --> |
| <!-- Min children: 1 --> |
| <!-- Max children: 2147483647 --> |
| |
| <!ELEMENT "UnknownChunk" EMPTY> |
| <!-- Unknown chunk data stored as a byte array --> |
| <!-- User object: array of byte --> |
| <!-- Min length: 0 --> |
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