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facsimile
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... suite of ITU-T Recommendations for Group 3 facsimile. These
Recommendations and the TIFF fields described here support the
...
... Recommendations and the TIFF fields described here support the
following facsimile modes or profiles:
...
... ITU-T Recommendations for Group 3 black-and-white,
grayscale and color facsimile. TIFF has historically been used for
handling fax ...
...
The full set of permitted fields of TIFF for facsimile are included
in the current TIFF specification, Section 2 of this document and the
...
... in the current TIFF specification, Section 2 of this document and the
sections on specific modes of facsimile operation. This document
defines profiles of TIFF ...
... defines profiles of TIFF for facsimile, where a profile is a subset
of the full set of permitted fields and field values of TIFF ...
...
Section 3 defines the minimal black-and-white facsimile mode (Profile
S), which is required in all implementations. Section 4 defines the
...
... defines the base color mode, required in all color implementations,
for the lossy JPEG representation of color and grayscale facsimile
data (Profile C). Section 7 defines the lossless ...
... lossless JBIG color and
grayscale facsimile mode (Profile L) and Section 8 defines the Mixed
Raster Content facsimile ...
... facsimile mode (Profile L) and Section 8 defines the Mixed
Raster Content facsimile mode (Profile M). Each of these sections
concludes with a table summarizing the required and recommended
...
... connection with TIFF for
facsimile. Sections 10, 11, 12 and 13 give Security Considerations,
the ISOC ...
... tree. All color implementations of TIFF
for facsimile MUST implement Profile C. The implementation of a
particular profile ...
... TIFF is designed for raster images, which makes it a good match for
facsimile documents, which are multi-page raster images. Each raster
image ...
... This specification recommends that when using a TIFF file for
facsimile, A multi-page fax document SHOULD be represented as a
linked list of IFDs ...
... IFDs. It also recommends that a TIFF file for
facsimile SHOULD order pages in a TIFF file in the same way that they
are ordered in a fax ...
...
Facsimile applications require (and recommend) a mixture of baseline
and extensions fields, as well as some new fields that are not part
of the TIFF ...
...
The fields required for facsimile have only a few legal values,
specified in the ITU-T Recommendations. Of these legal values, some
...
... Significant Bit first).
Default = 1 (field may be omitted if this is the value)
Facsimile data appears on the phone line in bit-reversed order
relative to its description in the relevant ITU ...
... ITU compression
Recommendation. Therefore, a wide majority of facsimile
implementations choose this natural order for storage. Nevertheless,
all readers conforming to this specification must be able to read
...
... 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
80, 160 pixels per centimeter (or 204, 408 pixels per inch). The
...
... terminals.
TIFF for Facsimile Writers SHOULD express XResolution in inch based
units, for consistency with historical practice and to maximize
...
... 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,
77, 154 pixels per centimeter (or 98, 196, 391 pixels per inch). The
...
... were allowed by [T.4] to permit conversions between inch and metric
based facsimile terminals. TIFF for Facsimile ...
... facsimile terminals. TIFF for Facsimile Writers SHOULD express
YResolution in inch based units, for consistency with historical
...
... profile is subset of the
full set of permitted fields and field values of TIFF for facsimile.
The currently defined values are:
0: does not conform to a profile ...
... 0: does not conform to a profile defined for TIFF for facsimile
1: minimal black & white lossless, Profile ...
... This section defines the minimal black-and-white subset of TIFF for
facsimile. This subset is designated Profile S. All implementations
of TIFF ...
...
The minimal interchange portion of the black-and-white facsimile mode
supports 1-dimensional Modified Huffman (MH) compression, with the
...
... The table below summarizes the TIFF fields that comprise the minimal
interchange set for black-and-white facsimile. The Baseline and
Extension fields and field values MUST be supported by all
...
... Profile F
of TIFF for facsimile. It provides a standard definition of what has
historically been known as TIFF Class ...
... encoding, but data is presented in a form which does not use EOLs,
and so TIFF for facsimile uses Compression=3 instead. See Sections
4.4.4, 4.5.1 and 4.5.2 for more information on compression ...
... Profile F readers must be able to read data in both bit orders,
but the vast majority of facsimile products store data LSB
first, exactly as it appears on the telephone line.
...
... T.4], A5 and A6 documents are no longer supported in
Group 3 facsimile, so the related width values are now obsolete. See
section 4.5.2 for more information on inch/metric equivalencies and
other implementation details.
...
... Each MMR encoded image MUST include an "end-of-facsimile-block"
(EOFB) code at the end of each coded strip; see Section 4.5.6.
...
... information contained in these fields is usually obtained from
receiving facsimile hardware (if applicable). They SHOULD NOT be used
in writing TIFF-F ...
... hardware (if applicable). They SHOULD NOT be used
in writing TIFF-F files for facsimile image data that is error
corrected or otherwise guaranteed not to have coding errors. Some
...
... has a low error level before importing it into a high-accuracy
document. Because Group 3 facsimile devices do not necessarily
perform error correction on the image data, the quality of a received
...
...
BadFaxLines(326) SHORT or LONG
The number of "bad" scan lines encountered by the facsimile device
during reception. A "bad" scanline is defined as a scanline that,
when decoded, comprises an incorrect number of pixels. Note that
...
... No default.
NOTE: Many facsimile devices do not actually output bad lines.
Instead, the previous good line is repeated in place of a bad line.
Although this substitution, known as line regeneration, results in a
...
... The CleanFaxData field describes the error content of the data. That
is, when the BadFaxLines and ImageLength fields indicate that the
facsimile device encountered lines with an incorrect number of pixels
during reception, the CleanFaxData field indicates whether these bad
lines are actually still in the data or if the receiving ...
... during reception, the CleanFaxData field indicates whether these bad
lines are actually still in the data or if the receiving facsimile
device replaced them with regenerated lines.
...
... FillOrder=2 be used only in special purpose applications.
Facsimile data appears on the phone line in bit-reversed order
relative to its description in ITU-T Recommendation ...
... ITU-T Recommendation T.4. Therefore,
a wide majority of facsimile applications choose this natural order
for data in a file. Nevertheless, TIFF-F readers must be able to read
...
...
In Group 3 facsimile, there are three compression methods which had
been standardized as of 1994 and are in common use. The ITU-T ...
... MMR was originally defined for use with Group 4
facsimile, so that this compression method has been commonly called
Group ...
... ConsecutiveBadFaxLines fields:
1. Facsimile hardware does not provide page quality
information: MUST NOT write page-quality fields.
...
... hardware does not provide page quality
information: MUST NOT write page-quality fields.
2. Facsimile hardware provides page quality information, but
reports no bad lines. Write only BadFaxLines = 0.
...
... hardware provides page quality information, but
reports no bad lines. Write only BadFaxLines = 0.
3. Facsimile hardware provides page quality information, and
reports bad lines. Write both BadFaxLines and
...
... image data is stored in multiple strips, then the strips
SHOULD occur in the file in the same order that the data they contain
occurs in the facsimile transmission, starting at the top of the
page.
...
... MMR).
For the case of resolution, almost all facsimile products support
both standard (98 dpi) vertical resolution and "fine" (196 dpi)
resolution. Therefore, fine-resolution files are quite portable in
...
... received from Group 3 facsimile devices. However, many facsimile
terminals and older versions ...
... These equivalencies were allowed by [T.4] to permit conversions
between inch and metric based facsimile terminals.
...
... As illustrated in FIGURE 1/T.4 in [T.4], facsimile documents encoded
with Modified Huffman begin with an EOL, which in TIFF-F may be byte-
...
... T.6 Modified Modified READ
compression method MUST include an "end-of-facsimile-block" (EOFB)
code at the end of each coded strip. Per [TIFF], the EOFB code is
...
... Profile J of TIFF for facsimile. Implementations of this profile are
required to also implement Profile ...
... Profile C of TIFF for
facsimile. Implementations of this profile are required to also
implement Profile ...
... Profile S.
This is the base mode for color and grayscale facsimile, which means
that all applications that support color fax must support this mode.
...
... Profile C readers must be able to read data in both bit orders,
but the vast majority of facsimile products store data LSB
first, exactly as it appears on the telephone line.
...
... Profile L of TIFF for
facsimile. Implementations of this profile are required to also
implement Profiles ...
... Profile F readers must be able to read data in both bit orders,
but the vast majority of facsimile products store data LSB
first, exactly as it appears on the telephone line.
...
... Profile M of
TIFF for facsimile. Implementations of this profile are required to
implement Profiles ...
... Profile F readers must be able to read data in both bit orders,
but the vast majority of facsimile products store data LSB
first, exactly as it appears on the telephone line.
...
... The two values of the image/tiff application parameter as defined for
facsimile are shown below, separated by a comma:
faxbw, faxcolor
...
... The "faxbw" application parameter is suitable for use by applications
that can process one or more TIFF for facsimile profiles or subsets
used for the encoding ...
... profiles or subsets
used for the encoding of black and white facsimile data.
The "faxcolor" application parameter is suitable for use by
...
... The "faxcolor" application parameter is suitable for use by
applications that can process one or more TIFF for facsimile profiles
or subsets that can be used for the encoding ...
... or subsets that can be used for the encoding of black and white, AND
color facsimile data.
Since this document defines several profiles ...
... Since this document defines several profiles of TIFF for facsimile,
the following rules should be followed when setting the application
parameter value ...
... ITU-T Recommendation T.4, Standardization of group 3 facsimile apparatus for document transmission, October 1997 ...
... ITU-T Recommendation T.6, Facsimile coding schemes and coding control functions for group 4 facsimile ...
... Facsimile coding schemes and coding control functions for group 4 facsimile apparatus, November 1988 ...
... ITU-T Recommendation T.30 - Procedures for Document Facsimile Transmission in the General Switched Telephone Network, June 1996 ...
... ITU-T Recommendation T.42, Continuous-tone colour representation method for facsimile, February 1996 ...
... T.43, Colour and gray-scale image representations using lossless coding scheme for facsimile, February 1997 ...
... faxbw - The "faxbw" application parameter is suitable for use by
applications that can process one or more TIFF for facsimile profiles
or subsets used for the encoding ...
... profiles
or subsets used for the encoding of black-and-white facsimile data.
The definition of the use of this value is contained in Section 9 of
this document (TIFFPLUS).
...
... Faxcolor - The "faxcolor" application parameter is suitable for use
by applications that can process one or more TIFF for facsimile
profiles or subsets that can be used for the encoding ...
... profiles or subsets that can be used for the encoding of black and
white, AND color facsimile data. The definition of the use of this
value is contained in Section 9 of this document (TIFFPLUS).
...