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7 <title>THUMBNAIL</title>

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11 <h1 align=center>THUMBNAIL</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="#BUGS">BUGS</a><br>

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

19 <hr>

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

21 <h2>NAME</h2>

22

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28 <p>thumbnail − create a <small>TIFF</small> file with

29 thumbnail images</p>

30 </td>

31 </table>

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

33 <h2>SYNOPSIS</h2>

34

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

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

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43 </table>

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

45 <h2>DESCRIPTION</h2>

46

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52 <p><i>thumbnail</i> is a program written to show how one

53 might use the SubIFD tag (#330) to store thumbnail images.

54 <i>thumbnail</i> copies a <small>TIFF</small> Class F

55 facsimile file to the output file and for each image an

56 8-bit greyscale <i>thumbnail sketch</i>. The output file

57 contains the thumbnail image with the associated

58 full-resolution page linked below with the SubIFD tag.</p>

59

60 <p>By default, thumbnail images are 216 pixels wide by 274

61 pixels high. Pixels are calculated by sampling and filtering

62 the input image with each pixel value passed through a

63 contrast curve.</p>

64 </td>

65 </table>

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

67 <h2>OPTIONS</h2>

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75 <p><b>−w</b></p>

76 </td>

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78 <td width="80%">

80 <p>Specify the width of thumbnail images in pixels.</p>

81 </td>

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83 </td>

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88 <p><b>−h</b></p>

89 </td>

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

91 <td width="80%">

93 <p>Specify the height of thumbnail images in pixels.</p>

94 </td>

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96 </td>

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100

101 <p><b>−c</b></p>

102 </td>

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105

106 <p>Specify a contrast curve to apply in generating the

107 thumbnail images. By default pixels values are passed

108 through a linear contrast curve that simply maps the pixel

109 value ranges. Alternative curves are: <b>exp50</b> for a 50%

110 exponential curve, <b>exp60</b> for a 60% exponential curve,

 <b>exp70</b> for a 70% exponential curve, <b>exp80</b> for a

112 80% exponential curve, <b>exp90</b> for a 90% exponential

113 curve, <b>exp</b> for a pure exponential curve,

114 <b>linear</b> for a linear curve.</p>

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117 </td>

118 </table>

119 <a name="BUGS"></a>

120 <h2>BUGS</h2>

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127 <p>There are no options to control the format of the saved

128 thumbnail images.</p>

129 </td>

130 </table>

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

132 <h2>SEE ALSO</h2>

133

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 <p><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1),

140 <b>libtiff</b>(3)</p>

141

142 <p>Libtiff library home page:

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

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