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Table 134 cHRM Chunk Data Format
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Field Name White Point X White Point Y Red X Red Y Green X Green Y Blue X Blue Y
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210,000 A gAMA chunk must precede any PLTE and IDAT chunks in the file The format of the gAMA chunk is shown in Table 135 hIST An encoder can place a hIST chunk in any PNG file that contains a PLTE chunk in order to supply decoders with the approximate usage frequencies for each color in the palette The hIST chunk can assist a decoder in selecting the colors to use if it is unable to display all the colors in the palette If an image contains a hIST chunk, it must follow the PLTE chunk and precede the IDAT chunks The hIST chunk data is an array of 2-byte, unsigned integers The number of array elements in the hIST chunk must be the same as the number of color entries in the PLTE chunk Each entry in the hIST array reflects the approximate relative usage of the corresponding color in the PLTE chunk If the encoder knows the absolute usage frequency of the colors within the palette, it can scale the values to fit into 16 bits However, a zero frequency value should only be used when a color is not used at all In the case of an RGB image, the frequency values will always be approximate and none should be zero pHYs The pHYs chunk is used to store the absolute or relative pixel size of the device used to view the image when it was created If a PNG file does not contain a pHYs chunk, the decoder should assume that the pixels are square and that the original physical size is unknown A pHYs chunk must precede the IDAT chunks in the file The format of the data for the pHYs chunk is shown in Table 136 When the Unit Specifier field is 0, the X and Y pixel dimensions in the pHYs chunk give the relative sizes of the pixels on the source display The decoder can use this information to scale the image on the output display If the
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Table 135 gAMA Chunk Data Format
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Table 136 pHYs Chunk Data
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Field Name Pixels Per Unit X Pixels Per Unit Y Unit Specifier
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0 The X and Y values give a ratio 1 Unit is meters
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U n i t Specifier field is 1, the X and Y dimensions give the number of pixels per meter on the source display The decoder can use this information to output the image in the same size it was on the source display sBIT An encoder can use an sBIT chunk to store the number of significant bits in the original sample data If the original data uses a bit depth that is not supported by PNG for example, 12 a decoder can use the information in an sBIT chunk to recreate the original sample values The format of the data within the sBIT depends upon the color type of the image Grayscale icant bits The chunk data contains 1 byte giving the number of signif-
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RGB and Palette The chunk data contains 3 bytes giving the number of significant bits for the red, green and blue components Grayscale with Alpha Channel The chunk data contains 2 bytes giving the number of significant bits for the grayscale data and Alpha channel RGB with Alpha Channel The chunk data contains 4 bytes that specify the number of significant bits in the source for the red, green, and blue components and Alpha channel, respectively All data values within the sBIT chunk must be greater than zero and less than or equal to the bit depth A decoder can use a procedure like this to convert a sample value from a PNG file to the value at the original bit depth unsigned int sourcemax = 1 << sBITvalue ; unsigned int filemax = 1 << BitDepth ; sourcevalue = (filevalue * sourcemax + filemax - 1) / filemax ; The process for an encoder is almost exactly the same unsigned int sourcemax = 1 << SourceBitDepth ; unsigned int filemax = 1 << FileDepth ; filevalue = (sourcevalue * filemax + sourcemax - 1) / sourcemax ; tEXt An encoder can use a tEXt chunk to store text information that does not affect the decoding of an image The tEXt chunk can appear anywhere between the IHDR and IEND chunks (except among the IDAT chunks) and there can be any number of them in a file