src/tiff/man/fax2tiff.1

   1 .\" $Id: fax2tiff.1,v 1.7 2006-04-20 12:17:19 dron Exp $
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   3 .\" Copyright (c) 1990-1997 Sam Leffler
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  25 .if n .po 0
  26 .TH FAX2TIFF 1 "November 2, 2005" "libtiff"
  27 .SH NAME
  28 fax2tiff \- create a
  29 .SM TIFF
  30 Class F fax file from raw fax data
  31 .SH SYNOPSIS
  32 .B fax2tiff
  33 [
  34 .I options
  35 ] [
  36 .B \-o
  37 .I output.tif
  38 ]
  39 .I input.raw
  40 .SH DESCRIPTION
  41 .I Fax2tiff
  42 creates a
  43 .SM TIFF
  44 file containing
  45 .SM CCITT
  46 Group 3 or Group 4 encoded data from one or more files containing ``raw''
  47 Group 3 or Group 4 encoded data (typically obtained directly from a fax modem).
  48 By default, each row of data in the resultant
  49 .SM TIFF
  50 file is 1-dimensionally encoded and
  51 padded or truncated to 1728 pixels, as needed.
  52 The resultant image is a set of low resolution (98 lines/inch)
  53 or medium resolution (196 lines/inch)
  54 pages, each of which is a single strip of data.
  55 The generated file conforms to the
  56 .SM TIFF
  57 Class F (\c
  58 .SM FAX\c
  59 ) specification for storing facsimile data.
  60 This means, in particular, that each page of the data does
  61 .B not
  62 include the trailing
  63 .I "return to control"
  64 (\c
  65 .SM RTC\c
  66 ) code; as required
  67 for transmission by the
  68 .SM CCITT
  69 Group 3 specifications.
  70 The old, ``classic'', format is created if the
  71 .B \-c
  72 option is used.
  73 (The Class F format can also be requested with the
  74 .B \-f
  75 option.)
  76 .PP
  77 The default name of the output image is
  78 .IR fax.tif ;
  79 this can be changed with the
  80 .B \-o
  81 option.
  82 Each input file is assumed to be a separate page of facsimile data
  83 from the same document.
  84 The order in which input files are specified on the command
  85 line is the order in which the resultant pages appear in the
  86 output file.
  87 .SH OPTIONS
  88 Options that affect the interpretation of input data are:
  89 .TP
  90 .B \-3
  91 Assume input data is
  92 .SM CCITT
  93 Group 3 encoded (default).
  94 .TP
  95 .B \-4
  96 Assume input data is
  97 .SM CCITT
  98 Group 4 encoded.
  99 .TP
 100 .B \-U
 101 Assume input data is uncompressed (Group 3 or Group 4).
 102 .TP
 103 .B \-1
 104 Assume input data is encoded with the 1-dimensional version of the
 105 .SM CCITT
 106 Group 3 Huffman encoding algorithm (default).
 107 .TP
 108 .B \-2
 109 Assume input data is 2-dimensional version of the
 110 .SM CCITT
 111 Group 3 Huffman encoding algorithm.
 112 .TP
 113 .B \-P
 114 Assume input data is
 115 .B not
 116 EOL-aligned (default). This option has effect with Group 3 encoded input only.
 117 .TP
 118 .B \-A
 119 Assume input data is EOL-aligned. This option has effect with Group 3
 120 encoded input only.
 121 .TP
 122 .B \-M
 123 Treat input data as having bits filled from most significant bit (\c
 124 .SM MSB\c
 125 ) to most least bit (\c
 126 .SM LSB\c
 127 ).
 128 .TP
 129 .B \-L
 130 Treat input data as having bits filled from least significant bit (\c
 131 .SM LSB\c
 132 ) to most significant bit (\c
 133 .SM MSB\c
 134 ) (default).
 135 .TP
 136 .B \-B
 137 Assume input data was encoded with black as 0 and white as 1.
 138 .TP
 139 .B \-W
 140 Assume input data was encoded with black as 1 and white as 0 (default).
 141 .TP
 142 .B \-R
 143 Specify the vertical resolution, in lines/inch, of the input images.
 144 By default input are assumed to have a vertical resolution of 196 lines/inch.
 145 If images are low resolution facsimile, a value of 98 lines/inch should
 146 be specified.
 147 .TP
 148 .B \-X
 149 Specify the width, in pixels, of the input images.
 150 By default input are assumed to have a width of 1728 pixels.
 151 .PP
 152 Options that affect the output file format are:
 153 .TP
 154 .B \-o
 155 Specify the name of the output file.
 156 .TP
 157 .B \-7
 158 Force output to be compressed with the
 159 .SM CCITT
 160 Group 3 Huffman encoding algorithm (default).
 161 .TP
 162 .B \-8
 163 Force output to be compressed with the
 164 .SM CCITT
 165 Group 4 Huffman encoding.
 166 .TP
 167 .B \-u
 168 Force output to be uncompressed (Group 3 or Group 4).
 169 .TP
 170 .B \-5
 171 Force output to be encoded with the 1-dimensional version of the
 172 .SM CCITT
 173 Group 3 Huffman encoding algorithm.
 174 .TP
 175 .B \-6
 176 Force output to be encoded with the 2-dimensional version of the
 177 .SM CCITT
 178 Group 3 Huffman encoding algorithm (default).
 179 .TP
 180 .B \-a
 181 Force the last bit of each
 182 .I "End Of Line"
 183 (\c
 184 .SM EOL\c
 185 ) code to land on a byte boundary (default). This ``zero padding'' will
 186 be reflected in the contents of the
 187 .I Group3Options
 188 tag of the resultant
 189 .SM TIFF
 190 file. This option has effect with Group 3 encoded output only.
 191 .TP
 192 .B \-p
 193 Do not EOL-align output. This option has effect with Group 3 encoded
 194 output only.
 195 .TP
 196 .B \-c
 197 Generate "classic" Group 3 TIFF format.
 198 .TP
 199 .B \-f
 200 Generate TIFF Class F (TIFF/F) format (default).
 201 .TP
 202 .B \-m
 203 Force output data to have bits filled from most significant bit (\c
 204 .SM MSB\c
 205 ) to most least bit (\c
 206 .SM LSB\c
 207 ).
 208 .TP
 209 .B \-l
 210 Force  output data to have bits filled from least significant bit (\c
 211 .SM LSB\c
 212 ) to most significant bit (\c
 213 .SM MSB\c
 214 ) (default).
 215 .TP
 216 .B \-r
 217 Specify the number of rows (scanlines) in each strip of data
 218 written to the output file.
 219 By default (or when value
 220 .B 0
 221 is specified),
 222 .I tiffcp
 223 attempts to set the rows/strip
 224 that no more than 8 kilobytes of data appear in a strip (with except of G3/G4
 225 compression schemes). If you specify special value
 226 .B \-1
 227 it will results in infinite number of the rows per strip. The entire image
 228 will be the one strip in that case. This is default in case of G3/G4 output
 229 compression schemes.
 230 .TP
 231 .B \-s
 232 Stretch the input image vertically by writing each input row of
 233 data twice to the output file.
 234 .TP
 235 .B \-v
 236 Force
 237 .I fax2tiff
 238 to print the number of rows of data it retrieved from the input file.
 239 .TP
 240 .B \-z
 241 Force output to be compressed with the LZW encoding.
 242 .SH DIAGNOSTICS
 243 The following warnings and errors come from the decoding
 244 routines in the library.
 245 .PP
 246 .BR "Warning, %s: Premature EOL at scanline %d (x %d).\en" .
 247 The input data had a row that was shorter than the expected width.
 248 The row is padded with white.
 249 .PP
 250 .BR "%s: Premature EOF at scanline %d (x %d).\en" .
 251 The decoder ran out of data in the middle of a scanline.
 252 The resultant row is padded with white.
 253 .PP
 254 .BR "%s: Bad code word at row %d, x %d\en" .
 255 An invalid Group 3
 256 .I code
 257 was encountered while decoding the input file.
 258 The row number and horizontal position is given.
 259 The remainder of the input row is discarded, while
 260 the corresponding output row is padded with white.
 261 .PP
 262 .BR "%s: Bad 2D code word at scanline %d.\en" .
 263 An invalid Group 4 or 2D Group 3
 264 .I code
 265 was encountered while decoding the input file.
 266 The row number and horizontal position is given.
 267 The remainder of the input row is discarded, while
 268 the corresponding output row is padded with white.
 269 .SH BUGS
 270 Input data are assumed to have a a ``top left'' orientation;
 271 it should be possible to override this assumption
 272 from the command line.
 273 .SH "SEE ALSO"
 274 .BR "\s-1CCITT\s+1 Recommendation T.4"
 275 (Standardization of Group 3 Facsimile Apparatus for Document Transmission).
 276 .PP
 277 .BR "The Spirit of TIFF Class F",
 278 an appendix to the TIFF 5.0 specification prepared by Cygnet Technologies.
 279 .PP
 280 .BR tiffinfo (1),
 281 .BR tiffdither (1),
 282 .BR tiffgt (1),
 283 .BR libtiff (3)
 284 .PP
 285 Libtiff library home page:
 286 .BR http://www.remotesensing.org/libtiff/