src/tiff/man/tiff2bw.1

   1 .\"     $Id: tiff2bw.1,v 1.2 2005/11/02 11:07:19 dron Exp $
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   3 .\" Copyright (c) 1988-1997 Sam Leffler
   4 .\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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   6 .\" Permission to use, copy, modify, distribute, and sell this software and
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  10 .\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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  25 .if n .po 0
  26 .TH TIFF2BW 1 "November 2, 2005" "libtiff"
  27 .SH NAME
  28 tiff2bw \- convert a color
  29 .SM TIFF
  30 image to greyscale
  31 .SH SYNOPSIS
  32 .B tiff2bw
  33 [
  34 options
  35 ]
  36 .I input.tif
  37 .I output.tif
  38 .SH DESCRIPTION
  39 .I Tiff2bw
  40 converts an
  41 .SM RGB
  42 or Palette color
  43 .SM TIFF
  44 image to a greyscale image by
  45 combining percentages of the red, green, and blue channels.
  46 By default, output samples are created by taking
  47 28% of the red channel, 59% of the green channel, and 11% of
  48 the blue channel.
  49 To alter these percentages, the
  50 .BR \-R ,
  51 .BR \-G ,
  52 and
  53 .BR \-B
  54 options may be used.
  55 .SH OPTIONS
  56 .TP
  57 .B \-c
  58 Specify a compression scheme to use when writing image data:
  59 .B "\-c none"
  60 for no compression,
  61 .B "-c packbits"
  62 for the PackBits compression algorithm,
  63 .B "-c zip
  64 for the Deflate compression algorithm,
  65 .B "-c g3
  66 for the CCITT Group 3 compression algorithm,
  67 .B "-c g4
  68 for the CCITT Group 4 compression algorithm,
  69 and
  70 .B "\-c lzw"
  71 for Lempel-Ziv & Welch (the default).
  72 .TP
  73 .B \-r
  74 Write data with a specified number of rows per strip;
  75 by default the number of rows/strip is selected so that each strip
  76 is approximately 8 kilobytes.
  77 .TP
  78 .B \-R
  79 Specify the percentage of the red channel to use (default 28).
  80 .TP
  81 .B \-G
  82 Specify the percentage of the green channel to use (default 59).
  83 .TP
  84 .B \-B
  85 Specify the percentage of the blue channel to use (default 11).
  86 .SH "SEE ALSO"
  87 .BR pal2rgb (1),
  88 .BR tiffinfo (1),
  89 .BR tiffcp (1),
  90 .BR tiffmedian (1),
  91 .BR libtiff (3)
  92 .PP
  93 Libtiff library home page:
  94 .BR http://www.remotesensing.org/libtiff/