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puid.fmt.10.xml
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<CompressionName>Run Length Encoding</CompressionName>
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<CompressionAliases>RLE</CompressionAliases>
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<Description>Run length encoding (RLE) is perhaps the simplest image compression technique in common use. RLE algorithms are lossless, and work by searching for runs of bits, bytes, or pixels of the same value, and encoding the length and value of the run. As such, RLE achieves best results with images containing large areas of contiguous colour, and especially monochrome images. Complex colour images, such as photographs, do not compress well – in some cases, RLE can actually increase the file size. There are a number of RLE variants in common use, which are encountered in the TIFF, PCX and BMP graphics formats.</Description>
<Lossiness>Lossless</Lossiness>
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<CompressionAliases>CCITT Group 3</CompressionAliases>
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<Description>Officially known as CCITT T.4, Group 3 is a compression algorithm developed by the International Telegraph and Telephone Consultative Committee in 1985 for encoding and compressing 1-bit (monochrome) image data. Its primary use has been in fax transmission, and it is optimised for scanned printed or handwritten documents. Group 3 is a lossless algorithm, of which two forms exist: one-dimensional (which is a modified version of Huffman encoding) and two-dimensional, which offers superior compression rates. Due to its origin as a data transmission protocol, Group 3 encoding incorporates error detection codes. Group 3 compression is most commonly used in the TIFF file format.</Description>
<Lossiness>Lossless</Lossiness>
<ReleaseDate>01 Jan 1985</ReleaseDate>
<WithdrawnDate>
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<CompressionAliases>CCITT Group 4</CompressionAliases>
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<Description>Officially known as CCITT T.6, Group 4 is a compression algorithm developed by the International Telegraph and Telephone Consultative Committee as a development of the two-dimensional Group 3 standard for encoding and compressing 1-bit (monochrome) image data. It is faster, and offers compression rates which are typically double those of Group 3. Like Group 3, it is lossless and designed for 1-bit images. However, being designed as a storage rather than transmission format, it does not incorporate the error detection and correction functions of Group 3 compression. Group 4 compression is most commonly used in the TIFF file format.</Description>
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