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7 <title>TIFF2BW</title>

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11 <h1 align=center>TIFF2BW</h1>

 <a href="#NAME">NAME</a><br>

 <a href="#SYNOPSIS">SYNOPSIS</a><br>

 <a href="#DESCRIPTION">DESCRIPTION</a><br>

 <a href="#OPTIONS">OPTIONS</a><br>

 <a href="#SEE ALSO">SEE ALSO</a><br>

18 <hr>

19 <a name="NAME"></a>

20 <h2>NAME</h2>

21

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27 <p>tiff2bw − convert a color <small>TIFF</small> image

28 to greyscale</p>

29 </td>

30 </table>

31 <a name="SYNOPSIS"></a>

32 <h2>SYNOPSIS</h2>

33

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 <p><b>tiff2bw</b> [ <i>options</i> ] <i>input.tif

40 output.tif</i></p>

41 </td>

42 </table>

43 <a name="DESCRIPTION"></a>

44 <h2>DESCRIPTION</h2>

45

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51 <p><i>Tiff2bw</i> converts an <small>RGB</small> or Palette

52 color <small>TIFF</small> image to a greyscale image by

53 combining percentages of the red, green, and blue channels.

54 By default, output samples are created by taking 28% of the

55 red channel, 59% of the green channel, and 11% of the blue

56 channel. To alter these percentages, the <b>−R</b>,

 <b>&minus;G</b>, and <b>&minus;B</b> options may be

58 used.</p>

59 </td>

60 </table>

61 <a name="OPTIONS"></a>

62 <h2>OPTIONS</h2>

63

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70 <p><b>−c</b></p>

71 </td>

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73 <td width="80%">

75 <p>Specify a compression scheme to use when writing image

 data: <b>&minus;c none</b> for no compression, <b>&minus;c

77 packbits</b> for the PackBits compression algorithm,

78 <b>−c zip</b> for the Deflate compression algorithm,

79 <b>−c g3</b> for the CCITT Group 3 compression

80 algorithm, <b>−c g4</b> for the CCITT Group 4

81 compression algorithm, and <b>−c lzw</b> for

82 Lempel-Ziv & Welch (the default).</p>

83 </td>

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85 </td>

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88 <td width="3%">

90 <p><b>−r</b></p>

91 </td>

92 <td width="5%"></td>

93 <td width="80%">

95 <p>Write data with a specified number of rows per strip; by

96 default the number of rows/strip is selected so that each

97 strip is approximately 8 kilobytes.</p>

98 </td>

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100 </td>

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104

105 <p><b>−R</b></p>

106 </td>

107 <td width="5%"></td>

108 <td width="80%">

109

110 <p>Specify the percentage of the red channel to use

111 (default 28).</p>

112 </td>

113 <td width="0%">

114 </td>

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117 <td width="3%">

118

119 <p><b>−G</b></p>

120 </td>

121 <td width="5%"></td>

122 <td width="80%">

123

124 <p>Specify the percentage of the green channel to use

125 (default 59).</p>

126 </td>

127 <td width="0%">

128 </td>

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130 <td width="10%"></td>

131 <td width="3%">

132

133 <p><b>−B</b></p>

134 </td>

135 <td width="5%"></td>

136 <td width="80%">

137

138 <p>Specify the percentage of the blue channel to use

139 (default 11).</p>

140 </td>

141 <td width="0%">

142 </td>

143 </table>

144 <a name="SEE ALSO"></a>

145 <h2>SEE ALSO</h2>

146

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 <p><b>pal2rgb</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),

 <b>tiffmedian</b>(1), <b>libtiff</b>(3)</p>

154

155 <p>Libtiff library home page:

156 <b>http://www.remotesensing.org/libtiff/</b></p>

157 </td>

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