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TIFF (Tagged Image File Format) (last review 1992) is a file format for mainly
storing images, including photographs and line art. It is one of the most popular and
flexible of the current public domain raster file formats. Originally created by the
company Aldus, jointly with Microsoft, for use with PostScript printing, TIFF is a
popular format for high color depth images, along with JPEG and PNG. TIFF format is
widely supported by image-manipulation applications, and by scanning, faxing, word
processing, optical character recognition, and other applications.
Compression types include
• uncompressed
• PackBits - is a fast, simple compression scheme for run-length encoding.
• Lempel-Ziv-Welch (LZW)
• CCITT Fax 3 & 4 – protocol for sending fax documents across telephone
lines
• JPEG (see below)
Until recently the use of this LZW was limited because this technique was the
subject of several patents in various jurisdictions.
Sometimes CCITT encoding is referred to, not entirely accurately, as Huffman
encoding. CCITT 1-dimensional encoding is a specific type of Huffman encoding. The
other types of CCITT encodings are not, however, implementations of the Huffman
scheme.
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