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ITU-T
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... Tag Image File Format) to
represent the data content and structure generated by the current
suite of ITU-T Recommendations for Group 3 facsimile. These
...
...
Each profile corresponds to the content of ITU-T Recommendations
shown and is a subset of the full TIFF for facsimile ...
... TIFF fields and field values required for compatibility
with the existing ITU-T Recommendations for Group 3 black-and-white,
grayscale and color facsimile ...
... encode the parameters that describe the image data. These fields will
have values that comply with the ITU-T Recommendations. The MIME
content type of the resulting file will be image/tiff, with an
...
... Profile S, the minimal mode, is based on Modified
Huffman (MH) compression, which are defined in ITU-T Rec. T.4.
Profile ...
... image data streams
within a strip. The formats of these streams follow the ITU-T
Recommendations. The Compression field in the IFD ...
... The fields required for facsimile have only a few legal values,
specified in the ITU-T Recommendations. Of these legal values, some
are required and some are optional, just as they are required
(mandatory) or optional in fax ...
... (mandatory) or optional in fax implementations that conform to the
ITU-T Recommendations. The required and optional values are noted in
the sections on the different fax modes.
...
... The horizontal resolution of the image in pixels per resolution
unit. The ITU-T Recommendations for facsimile specify a small number
of horizontal resolutions: 100, 200, 300, 400 pixels per inch, and
...
... interoperability. See the table below for information on how to
convert from an ITU-T metric value to its inch based equivalent
resolution.
No default, must be specified
...
... The vertical resolution of the image in pixels per resolution unit.
The ITU-T Recommendations for facsimile specify a small number of
vertical resolutions: 100, 200, 300, 400 pixels per inch, and 38.5,
...
... practice and to maximize interoperability. See the table below for
information on how to convert from an ITU-T metric value to its inch
based equivalent resolution. No default, must be specified
...
... T.4 (MH - Modified Huffman),
Bit 2: 2-dimensional coding, ITU-T Rec. T.4 (MR - Modified Read),
Bit ...
... Class F and now TIFF-F. In doing so,
it aligns this mode with current ITU-T Recommendations for black-
and-white fax and with existing industry practice. Implementations of
...
... TIFF Class F. Where some of the values for fields
have been updated to provide more precise conformance with the ITU-T
[T.4] and [T.30 ...
... TIFF Extension value [TIFF].
4 = 2-dimensional coding, ITU-T Rec. T.6 (MMR - Modified Modified
...
... Facsimile data appears on the phone line in bit-reversed order
relative to its description in ITU-T Recommendation T.4. Therefore,
a wide majority of facsimile ...
... facsimile, there are three compression methods which had
been standardized as of 1994 and are in common use. The ITU-T T.4
Recommendation [T.4 ...
... compression method
known as Modified Modified READ (MMR) was defined in the ITU-T T.6
Recommendation [T.6 ...
... the real world.
In 1993, the ITU-T added support for higher resolutions in the T.30
recommendation including 200 x 200, 300 x 300, 400 x 400 in dots per
...
... JBIG
compression. The ITU-T has approved the single-progression sequential
mode of JBIG [T.82 ...
... JBIG compression is
used in accordance with the application rules given in ITU-T Rec.
T.85 [T.85 ...
... Compression(259) = 9. SHORT
RequiredByTIFFBaseline
9 = ITU-T Rec. T.82 coding, applying ITU-T Rec. T.85 ...
... This section lists the required fields, in addition to those given in
Section 2.2.1, and the values they must support to be compatible with
ITU-T Rec. T.42 and Annex E in ITU-T ...
... fax mode requires pixel values to be stored using the CIE
L*a*b* encoding defined in ITU-T Rec. T.42. This encoding is
...
... TIFF
specification under YcbCr positioning for further information.
Default = 1, which is what ITU-T T.4, Annex E specifies.
...
... L*=Decode[1] when Lsample=255.
ITU-T Rec. T.42 specifies the ITULAB encoding in terms of a range ...
... default values correspond to the
base range and offset, as specified in ITU-T Rec. T.42 [T.42]. The
...
...
+-----------------------------------------------+
| ITU-T Rec. T.42 | Decode |
+---------+-----------| base values | default values ...
... only allows RGB color maps, but ITU-T Rec. T.43 requires L*a*b* color
maps, using the encoding ...
... T.43 requires L*a*b* color
maps, using the encoding specified in ITU-T Rec. T.42. Palette color
images ...
... T.43 uses the single-progression sequential mode of JBIG, defined in
ITU-T Rec. T.82. To code multi-level images ...
... This section lists the required fields, in addition to those in
Section 2.2.1, and the values they must have to be compatible with
ITU-T Rec. T.43.
...
... color map values so that all the L* values come first,
followed by all the a* values and then all the b* values. Because
ITU-T Rec. T.43 specifies a "chunky" ordering with the L*a*b*
components of the first value, followed by those of the second
...
... IFD;
Bit 4 indicates MRC imaging model as described in ITU-T
Recommendation T.44 [T.44], and must be set for Primary IFDs ...
... ITU-T Recommendation T.30 - Procedures for Document Facsimile Transmission in the General Switched Telephone Network ...
... ITU-T Recommendation T.81, Information technology - Digital compression and coding of continuous-tone still images ...
... ITU-T Recommendation T.82, Information technology - Coded representation of picture and audio information - Progressive bi- level image ...
... Voice Profile for Internet Mail - version 2", work in progress, <draft-ema-vpim-06.txt> The ITU-T Recommendations are available at http://www.itu.ch. ...