TIFF Tag Reference
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TIFF Tag CodingMethods
| IFD | | Image |
|---|---|---|
| Code | 403 (hex 0x0193) | |
| Name | CodingMethods | |
| Type | LONG | |
| Count | 1 | |
| Default | None |
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
See also
RFC 2301 - File Format for Internet Fax