1FAX2TIFF(1) General Commands Manual FAX2TIFF(1)
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6 fax2tiff - create a TIFF Class F fax file from raw fax data
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9 fax2tiff [ options ] [ -o output.tif ] input.raw
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12 Fax2tiff creates a TIFF file containing CCITT Group 3 or Group 4
13 encoded data from one or more files containing ``raw'' Group 3 or Group
14 4 encoded data (typically obtained directly from a fax modem). By
15 default, each row of data in the resultant TIFF file is 1-dimensionally
16 encoded and padded or truncated to 1728 pixels, as needed. The resul‐
17 tant image is a set of low resolution (98 lines/inch) or medium resolu‐
18 tion (196 lines/inch) pages, each of which is a single strip of data.
19 The generated file conforms to the TIFF Class F (FAX) specification for
20 storing facsimile data. This means, in particular, that each page of
21 the data does not include the trailing return to control (RTC) code; as
22 required for transmission by the CCITT Group 3 specifications. The
23 old, ``classic'', format is created if the -c option is used. (The
24 Class F format can also be requested with the -f option.)
25 The default name of the output image is fax.tif; this can be changed
27 with the -o option. Each input file is assumed to be a separate page
28 of facsimile data from the same document. The order in which input
29 files are specified on the command line is the order in which the
30 resultant pages appear in the output file.
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33 Options that affect the interpretation of input data are:
34 -3 Assume input data is CCITT Group 3 encoded (default).
36 -4 Assume input data is CCITT Group 4 encoded.
38 -U Assume input data is uncompressed (Group 3 or Group 4).
40 -1 Assume input data is encoded with the 1-dimensional version of
42 the CCITT Group 3 Huffman encoding algorithm (default).
43 -2 Assume input data is 2-dimensional version of the CCITT Group 3
45 Huffman encoding algorithm.
46 -P Assume input data is not EOL-aligned (default). This option has
48 effect with Group 3 encoded input only.
49 -A Assume input data is EOL-aligned. This option has effect with
51 Group 3 encoded input only.
52 -M Treat input data as having bits filled from most significant bit
54 (MSB) to most least bit (LSB).
55 -L Treat input data as having bits filled from least significant
57 bit (LSB) to most significant bit (MSB) (default).
58 -B Assume input data was encoded with black as 0 and white as 1.
60 -W Assume input data was encoded with black as 1 and white as 0
62 (default).
63 -R Specify the vertical resolution, in lines/inch, of the input
65 images. By default input are assumed to have a vertical resolu‐
66 tion of 196 lines/inch. If images are low resolution facsimile,
67 a value of 98 lines/inch should be specified.
68 -X Specify the width, in pixels, of the input images. By default
70 input are assumed to have a width of 1728 pixels.
71 Options that affect the output file format are:
73 -o Specify the name of the output file.
75 -7 Force output to be compressed with the CCITT Group 3 Huffman
77 encoding algorithm (default).
78 -8 Force output to be compressed with the CCITT Group 4 Huffman
80 encoding.
81 -u Force output to be uncompressed (Group 3 or Group 4).
83 -5 Force output to be encoded with the 1-dimensional version of the
85 CCITT Group 3 Huffman encoding algorithm.
86 -6 Force output to be encoded with the 2-dimensional version of the
88 CCITT Group 3 Huffman encoding algorithm (default).
89 -a Force the last bit of each End Of Line (EOL) code to land on a
91 byte boundary (default). This ``zero padding'' will be reflected
92 in the contents of the Group3Options tag of the resultant TIFF
93 file. This option has effect with Group 3 encoded output only.
94 -p Do not EOL-align output. This option has effect with Group 3
96 encoded output only.
97 -c Generate "classic" Group 3 TIFF format.
99 -f Generate TIFF Class F (TIFF/F) format (default).
101 -m Force output data to have bits filled from most significant bit
103 (MSB) to most least bit (LSB).
104 -l Force output data to have bits filled from least significant
106 bit (LSB) to most significant bit (MSB) (default).
107 -r Specify the number of rows (scanlines) in each strip of data
109 written to the output file. By default (or when value 0 is
110 specified), tiffcp attempts to set the rows/strip that no more
111 than 8 kilobytes of data appear in a strip (with except of G3/G4
112 compression schemes). If you specify special value -1 it will
113 results in infinite number of the rows per strip. The entire
114 image will be the one strip in that case. This is default in
115 case of G3/G4 output compression schemes.
116 -s Stretch the input image vertically by writing each input row of
118 data twice to the output file.
119 -v Force fax2tiff to print the number of rows of data it retrieved
121 from the input file.
122 -z Force output to be compressed with the LZW encoding.
124
126 The following warnings and errors come from the decoding routines in
127 the library.
128 Warning, %s: Premature EOL at scanline %d (x %d).\n. The input data
130 had a row that was shorter than the expected width. The row is padded
131 with white.
132 %s: Premature EOF at scanline %d (x %d).\n. The decoder ran out of
134 data in the middle of a scanline. The resultant row is padded with
135 white.
136 %s: Bad code word at row %d, x %d\n. An invalid Group 3 code was
138 encountered while decoding the input file. The row number and horizon‐
139 tal position is given. The remainder of the input row is discarded,
140 while the corresponding output row is padded with white.
141 %s: Bad 2D code word at scanline %d.\n. An invalid Group 4 or 2D Group
143 3 code was encountered while decoding the input file. The row number
144 and horizontal position is given. The remainder of the input row is
145 discarded, while the corresponding output row is padded with white.
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148 Input data are assumed to have a a ``top left'' orientation; it should
149 be possible to override this assumption from the command line.
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152 CCITT Recommendation T.4 (Standardization of Group 3 Facsimile Appara‐
153 tus for Document Transmission).
154 The Spirit of TIFF Class F, an appendix to the TIFF 5.0 specification
156 prepared by Cygnet Technologies.
157 tiffinfo(1), tiffdither(1), tiffgt(1), libtiff(3)
159 Libtiff library home page: http://www.remotesensing.org/libtiff/
161libtiff November 2, 2005 FAX2TIFF(1)