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TIFF Tag CodingMethods

IFDImage
Code403 (hex 0x0193)
NameCodingMethods
TypeLONG
Count1
DefaultNone

Description

Used in the TIFF-FX standard, indicates which coding methods are used in the file.

A bit value of 1 indicates a particular coding methods is used. The TIFF-FX specification defines these bits:

Bit 0 = unspecified compression
Bit 1 = 1-dimensional coding, ITU-T Rec. T.4 (MH - Modified Huffman)
Bit 2 = 2-dimensional coding, ITU-T Rec. T.4 (MR - Modified Read)
Bit 3 = 2-dimensional coding, ITU-T Rec. T.6 (MMR - Modified MR)
Bit 4 = ITU-T Rec. T.82 coding, using ITU-T Rec. T.85 (JBIG)
Bit 5 = ITU-T Rec. T.81 (Baseline JPEG)
Bit 6 = ITU-T Rec. T.82 coding, using ITU-T Rec. T.43 (JBIG color)
Bits 7-31 = reserved for future use

The tag is described to be primarly used inside a GlobalParameters IFD, although the specification says that 'each field in the GlobalParametersIFD is a TIFF field that is legal in any IFD'.

Related tags

GlobalParametersIFD

See also

RFC 2301 - File Format for Internet Fax