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- Group_4_compression abstract "CCITT Group 4 compression, also referred to as G4 or Modified Modified READ (MMR), is a lossless method of image compression used in Group 4 fax machines defined in the ITU-T T.6 fax standard. It is only used for bitonal (black and white) images. Group 4 compression is based on the Group 3 two-dimensional compression scheme (G3-2D), also known as Modified READ, which is in turn based on the Group 3 one-dimensional compression scheme (G3), also known as Modified Huffman coding. Group 4 compression is available in many proprietary image file formats as well as standardized formats such as TIFF, CALS, and the PDF document format.G4 offers a small improvement over G3-2D by removing the end of line (EOL) codes. G3 and G4 compression both treat an image as a series of horizontal black strips on a white page. Better compression is achieved when there are fewer unique black dots/lines on the page. Both G3-2D and G4 add a two dimensional feature to achieve greater compression by taking advantage of vertical symmetry. A worst-case image would be an alternating pattern of single-pixel black and white dots offset by one pixel on even/odd lines. G4 compression would actually increase the file size on this type of image. G4 typically achieves a 20:1 compression ratio. For an 8.5\"x11\" page scanned at 200 DPI, this equates to a reduction from 456.54 kB to 22.82 kB (95% compression ratio).".
- Group_4_compression wikiPageID "26420269".
- Group_4_compression wikiPageLength "2162".
- Group_4_compression wikiPageOutDegree "19".
- Group_4_compression wikiPageRevisionID "633228712".
- Group_4_compression wikiPageWikiLink Binary_image.
- Group_4_compression wikiPageWikiLink CALS_Raster_file_format.
- Group_4_compression wikiPageWikiLink Category:Fax.
- Group_4_compression wikiPageWikiLink Data_compression_ratio.
- Group_4_compression wikiPageWikiLink Dots_per_inch.
- Group_4_compression wikiPageWikiLink Fax.
- Group_4_compression wikiPageWikiLink ITU-T.
- Group_4_compression wikiPageWikiLink Image_compression.
- Group_4_compression wikiPageWikiLink Image_file_formats.
- Group_4_compression wikiPageWikiLink JBIG2.
- Group_4_compression wikiPageWikiLink Lossless_compression.
- Group_4_compression wikiPageWikiLink Modified_Huffman_coding.
- Group_4_compression wikiPageWikiLink Newline.
- Group_4_compression wikiPageWikiLink Portable_Document_Format.
- Group_4_compression wikiPageWikiLink Tagged_Image_File_Format.
- Group_4_compression wikiPageWikiLinkText "CCITT G4".
- Group_4_compression wikiPageWikiLinkText "CCITT Group 4 fax".
- Group_4_compression wikiPageWikiLinkText "Fax Group 4".
- Group_4_compression wikiPageWikiLinkText "Group 4 compression".
- Group_4_compression wikiPageWikiLinkText "Group 4".
- Group_4_compression wikiPageWikiLinkText "Group IV 2D compression".
- Group_4_compression wikiPageWikiLinkText "Modified Modified READ".
- Group_4_compression wikiPageUsesTemplate Template:Citation_needed.
- Group_4_compression wikiPageUsesTemplate Template:Cite_web.
- Group_4_compression wikiPageUsesTemplate Template:Compression_formats.
- Group_4_compression subject Category:Fax.
- Group_4_compression hypernym Method.
- Group_4_compression type Software.
- Group_4_compression comment "CCITT Group 4 compression, also referred to as G4 or Modified Modified READ (MMR), is a lossless method of image compression used in Group 4 fax machines defined in the ITU-T T.6 fax standard. It is only used for bitonal (black and white) images. Group 4 compression is based on the Group 3 two-dimensional compression scheme (G3-2D), also known as Modified READ, which is in turn based on the Group 3 one-dimensional compression scheme (G3), also known as Modified Huffman coding.".
- Group_4_compression label "Group 4 compression".
- Group_4_compression sameAs Q17125070.
- Group_4_compression sameAs Compresión_G4_de_CCITT.
- Group_4_compression sameAs m.0bbx3zh.
- Group_4_compression sameAs Q17125070.
- Group_4_compression wasDerivedFrom Group_4_compression?oldid=633228712.
- Group_4_compression isPrimaryTopicOf Group_4_compression.