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FAX2TIFF

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

DIAGNOSTICS

BUGS

SEE ALSO

NAME

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fax2tiff − create a <small>TIFF</small> Class F fax

file from raw fax data

SYNOPSIS

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fax2tiff [ options ] [ −o

output.tif ] input.raw

DESCRIPTION

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Fax2tiff creates a <small>TIFF</small> file

containing <small>CCITT</small> Group 3 or Group 4 encoded

data from one or more files containing

‘‘raw’’ Group 3 or Group 4 encoded

data (typically obtained directly from a fax modem). By

default, each row of data in the resultant

<small>TIFF</small> file is 1-dimensionally encoded and

padded or truncated to 1728 pixels, as needed. The resultant

image is a set of low resolution (98 lines/inch) or medium

resolution (196 lines/inch) pages, each of which is a single

strip of data. The generated file conforms to the

<small>TIFF</small> Class F ( <small>FAX</small> )

specification for storing facsimile data. This means, in

particular, that each page of the data does not

include the trailing return to control (

<small>RTC</small> ) code; as required for transmission by

the <small>CCITT</small> Group 3 specifications. The old,

‘‘classic’’, format is created if

the −c option is used. (The Class F format can

also be requested with the −f option.)

The default name of the output image is fax.tif;

this can be changed with the −o option. Each

input file is assumed to be a separate page of facsimile

data from the same document. The order in which input files

are specified on the command line is the order in which the

resultant pages appear in the output file.

OPTIONS

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Options that affect the interpretation of input data

are:

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−3

Assume input data is <small>CCITT</small> Group 3

encoded (default).

−4

Assume input data is <small>CCITT</small> Group 4

encoded.

−U

Assume input data is uncompressed (Group 3 or Group

4).

−1

Assume input data is encoded with the 1-dimensional

version of the <small>CCITT</small> Group 3 Huffman encoding

algorithm (default).

−2

Assume input data is 2-dimensional version of the

<small>CCITT</small> Group 3 Huffman encoding algorithm.

−P

Assume input data is not EOL-aligned (default).

This option has effect with Group 3 encoded input only.

−A

Assume input data is EOL-aligned. This option has effect

with Group 3 encoded input only.

−M

Treat input data as having bits filled from most

significant bit ( <small>MSB</small> ) to most least bit (

<small>LSB</small> ).

−L

Treat input data as having bits filled from least

significant bit ( <small>LSB</small> ) to most significant

bit ( <small>MSB</small> ) (default).

−B

Assume input data was encoded with black as 0 and white

as 1.

−W

Assume input data was encoded with black as 1 and white

as 0 (default).

−R

Specify the vertical resolution, in lines/inch, of the

input images. By default input are assumed to have a

vertical resolution of 196 lines/inch. If images are low

resolution facsimile, a value of 98 lines/inch should be

specified.

−X

Specify the width, in pixels, of the input images. By

default input are assumed to have a width of 1728

pixels.

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Options that affect the output file format are:

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−o

Specify the name of the output file.

−7

Force output to be compressed with the

<small>CCITT</small> Group 3 Huffman encoding algorithm

(default).

−8

Force output to be compressed with the

<small>CCITT</small> Group 4 Huffman encoding.

−u

Force output to be uncompressed (Group 3 or Group

4).

−5

Force output to be encoded with the 1-dimensional

version of the <small>CCITT</small> Group 3 Huffman encoding

algorithm.

−6

Force output to be encoded with the 2-dimensional

version of the <small>CCITT</small> Group 3 Huffman encoding

algorithm (default).

−a

Force the last bit of each End Of Line (

<small>EOL</small> ) code to land on a byte boundary

(default). This ‘‘zero padding’’

will be reflected in the contents of the

Group3Options tag of the resultant

<small>TIFF</small> file. This option has effect with Group

3 encoded output only.

−p

Do not EOL-align output. This option has effect with

Group 3 encoded output only.

−c

Generate "classic" Group 3 TIFF format.

−f

Generate TIFF Class F (TIFF/F) format (default).

−m

Force output data to have bits filled from most

significant bit ( <small>MSB</small> ) to most least bit (

<small>LSB</small> ).

−l

Force output data to have bits filled from least

significant bit ( <small>LSB</small> ) to most significant

bit ( <small>MSB</small> ) (default).

−r

Specify the number of rows (scanlines) in each strip of

data written to the output file. By default (or when value

0 is specified), tiffcp attempts to set the

rows/strip that no more than 8 kilobytes of data appear in a

strip (with except of G3/G4 compression schemes). If you

specify special value −1 it will results in

infinite number of the rows per strip. The entire image will

be the one strip in that case. This is default in case of

G3/G4 output compression schemes.

−s

Stretch the input image vertically by writing each input

row of data twice to the output file.

−v

Force fax2tiff to print the number of rows of

data it retrieved from the input file.

−z

Force output to be compressed with the LZW encoding.

DIAGNOSTICS

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The following warnings and errors come from the decoding

routines in the library.

Warning, %s: Premature EOL at scanline %d (x

%d).\n. The input data had a row that was shorter than

the expected width. The row is padded with white.

%s: Premature EOF at scanline %d (x %d).\n. The

decoder ran out of data in the middle of a scanline. The

resultant row is padded with white.

%s: Bad code word at row %d, x %d\n. An invalid

Group 3 code was encountered while decoding the input

file. The row number and horizontal position is given. The

remainder of the input row is discarded, while the

corresponding output row is padded with white.

%s: Bad 2D code word at scanline %d.\n. An invalid

Group 4 or 2D Group 3 code was encountered while

decoding the input file. The row number and horizontal

position is given. The remainder of the input row is

discarded, while the corresponding output row is padded with

white.

BUGS

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Input data are assumed to have a a ‘‘top

left’’ orientation; it should be possible to

override this assumption from the command line.

SEE ALSO

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<small>CCITT</small> Recommendation T.4

(Standardization of Group 3 Facsimile Apparatus for Document

Transmission).

The Spirit of TIFF Class F, an appendix to the

TIFF 5.0 specification prepared by Cygnet Technologies.

tiffinfo(1), tiffdither(1),

tiffgt(1), libtiff(3)

Libtiff library home page:

http://www.remotesensing.org/libtiff/