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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.[citation needed] For a 8.5"x11" page scanned at 200DPI, this equates to a reduction from 456.54 kB to 22.82 kB.".
- Group_4_compression wikiPageID "26420269".
- Group_4_compression wikiPageRevisionID "604530509".
- Group_4_compression hasPhotoCollection Group_4_compression.
- Group_4_compression subject Category:Fax.
- 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 m.0bbx3zh.
- Group_4_compression sameAs Q17125070.
- Group_4_compression sameAs Q17125070.
- Group_4_compression wasDerivedFrom Group_4_compression?oldid=604530509.
- Group_4_compression isPrimaryTopicOf Group_4_compression.