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For the machine that sends, receives, and produces facsimiles, see fax.
A facsimile is any copy or reproduction, which bears a close resemblance to the original. The word is mainly used in the context of fax telecommunications technology. A Samsung fax machine Fax (short for facsimile, from Latin fac simile, make similar, i. ... A Samsung fax machine Fax (short for facsimile, from Latin fac simile, make similar, i. ...
A "Facsimile Edition" in publishing is a new edition of an (often classic) book, in the form of an exact reproduction of the original edition, including the typeface and layout of the pages. This article is concerned with the production of books, magazines, and other literary material (whether in printed or electronic formats). ... For the origin and evolution of fonts, see History of western typography. ...
Facsimile is used to transmit such materials as documents, telegrams, drawings, pictures taken from satellites, and even entire newspapers.
The surface of the material to be sent is traversed by a light-beam and a photodiode that translates the light and dark areas of the material thus scanned into electric signals for transmission.
Facsimile machines that produce higher-resolution images, or color and gray-scale images are also available.
The compression method uses a Huffman codebook for run lengths of fl and white runs in a single scanned line, and it also uses the fact that two adjacent scanlines are usually quite similar, saving bandwidth by encoding only the differences.
The codes used for sending facsimiles are: Modified Huffman (MH), Modified READ (MR) (known also as CCITT Group 3 fax encoding or CCITT T.4) and Modified Modified READ (MMR)(known also as CCITT Group 4 fax encoding or CCITT T.6).
An early method for facsimile transmission, the Hellschreiber, was invented in 1929 by Rudolf Hell, a pioneer in mechanical image scanning and transmission.
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