CCITT Group 3 - Revision history

Dexvertbot: Change telparia.com samples link to template

2023-12-28T02:56:42Z

Change telparia.com samples link to template

2021-11-28T23:20:10Z

Added abydos as software and a sample files link

2020-12-02T14:23:33Z

‎Specifications

2020-08-25T01:32:59Z

2019-10-28T05:54:54Z

2016-07-02T19:34:14Z

2016-02-22T14:42:18Z

2015-11-11T21:39:50Z

‎Related formats

2015-11-11T21:36:16Z

2015-09-04T23:54:12Z

Category:Fax

@@ Line 34: / Line 34: @@
 == Sample files ==
-* https://telparia.com/fileFormatSamples/image/faxGroup3/
+* {{DexvertSamples|image/faxGroup3}}
 == Links ==

@@ Line 31: / Line 31: @@
 * [[ImageMagick]] (format named "FAX")
 * [[Farbfeld Utilities]]
 == Links ==

@@ Line 23: / Line 23: @@
 == Specifications ==
-* [http://www.itu.int/rec/T-REC-T.4/en ITU-T Recommendation T.4]
+* [https://www.itu.int/rec/T-REC-T.4/en ITU-T Recommendation T.4]
-* [http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf TIFF 6.0 Specification], Section 10: Modified Huffman Compression
+* [https://www.adobe.io/open/standards/TIFF.html Adobe TIFF standards] → TIFF6.pdf, Section 10: Modified Huffman Compression - Defines a slightly simplified form of the 1-d format
 == Software ==

@@ Line 2: / Line 2: @@
 |formattype=electronic
 |subcat=Compression
 |extensions={{ext|g3}}
 |mimetypes={{mimetype|image/g3fax}}

@@ Line 29: / Line 29: @@
 * [[Netpbm]]: g3topbm, pbmtog3
 * [[ImageMagick]] (format named "FAX")
 == Links ==

@@ Line 3: / Line 3: @@
 |subcat=Compression
 |extensions={{ext|g3}}
 |pronom={{PRONOM|x-cmp/14}}
 }}
@@ Line 28: / Line 29: @@
 * [[Netpbm]]: g3topbm, pbmtog3
 * [[ImageMagick]] (format named "FAX")
 [[Category:Graphics]]
 [[Category:Fax]]

← Older revision		Revision as of 21:39, 11 November 2015
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	== Related formats ==		== Related formats ==
		+
		+	Many of the formats listed in the [[Fax formats]] article use CCITT Group 3 compression.

	In a [[TIFF]] file, compression codes 2, 3, and 32771 are varieties of CCITT Group 3 compression.		In a [[TIFF]] file, compression codes 2, 3, and 32771 are varieties of CCITT Group 3 compression.

@@ Line 1: / Line 1: @@
 {{FormatInfo
 |formattype=electronic
-|subcat=Graphics
+|subcat=Compression
 |extensions={{ext|g3}}
 |pronom={{PRONOM|x-cmp/14}}
 }}
-'''CCITT Group 3''' is a lossless compressed data format for bi-level images. It is also known as '''T4''', '''T.4''', '''Fax3''', '''Group 3''', '''G3''', or '''ITU-T Fax Group 3'''. It is one of the formats used by fax machines. It is usually embedded in another image file format such as [[TIFF]], but can be stored in a file by itself.
+'''CCITT Group 3''' is a lossless compressed data format for bi-level images. It is also known as '''T4''', '''T.4''', '''Fax3''', '''Group 3''', '''G3''', or '''ITU-T Fax Group 3'''. It is one of the formats used by [[fax machine]]s. It is usually embedded in another image file format such as [[TIFF]], but can be stored in a file by itself.
 It comes in two main varieties: so-called '''1-dimensional''' and '''2-dimensional''' (though both are used on 2-dimensional images). The 1-dimensional variety uses [[Modified Huffman]] (MH) compression, and the 2-dimensional variety uses [[Modified READ]] (MR) compression.
@@ Line 26: / Line 26: @@
 * [[ImageMagick]] (format named "FAX")
-[[Category:Compression]]
+[[Category:Graphics]]
 [[Category:Fax]]