src/tiff/man/tiff2bw.1

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  24 .if n .po 0
  25 .TH TIFF2BW 1 "November 2, 2005" "libtiff"
  26 .SH NAME
  27 tiff2bw \- convert a color
  28 .SM TIFF
  29 image to greyscale
  30 .SH SYNOPSIS
  31 .B tiff2bw
  32 [
  33 .I options
  34 ]
  35 .I input.tif
  36 .I output.tif
  37 .SH DESCRIPTION
  38 .I Tiff2bw
  39 converts an
  40 .SM RGB
  41 or Palette color
  42 .SM TIFF
  43 image to a greyscale image by
  44 combining percentages of the red, green, and blue channels.
  45 By default, output samples are created by taking
  46 28% of the red channel, 59% of the green channel, and 11% of
  47 the blue channel.
  48 To alter these percentages, the
  49 .BR \-R ,
  50 .BR \-G ,
  51 and
  52 .BR \-B
  53 options may be used.
  54 .SH OPTIONS
  55 .TP
  56 .B \-c
  57 Specify a compression scheme to use when writing image data:
  58 .B "\-c none"
  59 for no compression,
  60 .B "\-c packbits"
  61 for the PackBits compression algorithm,
  62 .B "\-c zip
  63 for the Deflate compression algorithm,
  64 .B "\-c g3
  65 for the CCITT Group 3 compression algorithm,
  66 .B "\-c g4
  67 for the CCITT Group 4 compression algorithm,
  68 and
  69 .B "\-c lzw"
  70 for Lempel-Ziv & Welch (the default).
  71 .TP
  72 .B \-r
  73 Write data with a specified number of rows per strip;
  74 by default the number of rows/strip is selected so that each strip
  75 is approximately 8 kilobytes.
  76 .TP
  77 .B \-R
  78 Specify the percentage of the red channel to use (default 28).
  79 .TP
  80 .B \-G
  81 Specify the percentage of the green channel to use (default 59).
  82 .TP
  83 .B \-B
  84 Specify the percentage of the blue channel to use (default 11).
  85 .SH "SEE ALSO"
  86 .BR pal2rgb (1),
  87 .BR tiffinfo (1),
  88 .BR tiffcp (1),
  89 .BR tiffmedian (1),
  90 .BR libtiff (3)
  91 .PP
  92 Libtiff library home page:
  93 .BR http://www.remotesensing.org/libtiff/