1<!-- Creator : groff version 1.18.1 --> 2<!-- CreationDate: Sat Feb 24 18:37:19 2007 --> 3<html> 4<head> 5<meta name="generator" content="groff -Thtml, see www.gnu.org"> 6<meta name="Content-Style" content="text/css"> 7<title>THUMBNAIL</title> 8</head> 9<body> 10 11<h1 align=center>THUMBNAIL</h1> 12<a href="#NAME">NAME</a><br> 13<a href="#SYNOPSIS">SYNOPSIS</a><br> 14<a href="#DESCRIPTION">DESCRIPTION</a><br> 15<a href="#OPTIONS">OPTIONS</a><br> 16<a href="#BUGS">BUGS</a><br> 17<a href="#SEE ALSO">SEE ALSO</a><br> 18 19<hr> 20<a name="NAME"></a> 21<h2>NAME</h2> 22<!-- INDENTATION --> 23<table width="100%" border=0 rules="none" frame="void" 24 cols="2" cellspacing="0" cellpadding="0"> 25<tr valign="top" align="left"> 26<td width="8%"></td> 27<td width="91%"> 28<p>thumbnail − create a <small>TIFF</small> file with 29thumbnail images</p> 30</td> 31</table> 32<a name="SYNOPSIS"></a> 33<h2>SYNOPSIS</h2> 34<!-- INDENTATION --> 35<table width="100%" border=0 rules="none" frame="void" 36 cols="2" cellspacing="0" cellpadding="0"> 37<tr valign="top" align="left"> 38<td width="8%"></td> 39<td width="91%"> 40<p><b>thumbnail</b> [ <i>options</i> ] <i>input.tif 41output.tif</i></p> 42</td> 43</table> 44<a name="DESCRIPTION"></a> 45<h2>DESCRIPTION</h2> 46<!-- INDENTATION --> 47<table width="100%" border=0 rules="none" frame="void" 48 cols="2" cellspacing="0" cellpadding="0"> 49<tr valign="top" align="left"> 50<td width="8%"></td> 51<td width="91%"> 52<p><i>thumbnail</i> is a program written to show how one 53might use the SubIFD tag (#330) to store thumbnail images. 54<i>thumbnail</i> copies a <small>TIFF</small> Class F 55facsimile file to the output file and for each image an 568-bit greyscale <i>thumbnail sketch</i>. The output file 57contains the thumbnail image with the associated 58full-resolution page linked below with the SubIFD tag.</p> 59<!-- INDENTATION --> 60<p>By default, thumbnail images are 216 pixels wide by 274 61pixels high. Pixels are calculated by sampling and filtering 62the input image with each pixel value passed through a 63contrast curve.</p> 64</td> 65</table> 66<a name="OPTIONS"></a> 67<h2>OPTIONS</h2> 68<!-- TABS --> 69<table width="100%" border=0 rules="none" frame="void" 70 cols="5" cellspacing="0" cellpadding="0"> 71<tr valign="top" align="left"> 72<td width="10%"></td> 73<td width="3%"> 74 75<p><b>−w</b></p> 76</td> 77<td width="5%"></td> 78<td width="80%"> 79 80<p>Specify the width of thumbnail images in pixels.</p> 81</td> 82<td width="0%"> 83</td> 84<tr valign="top" align="left"> 85<td width="10%"></td> 86<td width="3%"> 87 88<p><b>−h</b></p> 89</td> 90<td width="5%"></td> 91<td width="80%"> 92 93<p>Specify the height of thumbnail images in pixels.</p> 94</td> 95<td width="0%"> 96</td> 97<tr valign="top" align="left"> 98<td width="10%"></td> 99<td width="3%"> 100 101<p><b>−c</b></p> 102</td> 103<td width="5%"></td> 104<td width="80%"> 105 106<p>Specify a contrast curve to apply in generating the 107thumbnail images. By default pixels values are passed 108through a linear contrast curve that simply maps the pixel 109value ranges. Alternative curves are: <b>exp50</b> for a 50% 110exponential curve, <b>exp60</b> for a 60% exponential curve, 111<b>exp70</b> for a 70% exponential curve, <b>exp80</b> for a 11280% exponential curve, <b>exp90</b> for a 90% exponential 113curve, <b>exp</b> for a pure exponential curve, 114<b>linear</b> for a linear curve.</p> 115</td> 116<td width="0%"> 117</td> 118</table> 119<a name="BUGS"></a> 120<h2>BUGS</h2> 121<!-- INDENTATION --> 122<table width="100%" border=0 rules="none" frame="void" 123 cols="2" cellspacing="0" cellpadding="0"> 124<tr valign="top" align="left"> 125<td width="8%"></td> 126<td width="91%"> 127<p>There are no options to control the format of the saved 128thumbnail images.</p> 129</td> 130</table> 131<a name="SEE ALSO"></a> 132<h2>SEE ALSO</h2> 133<!-- INDENTATION --> 134<table width="100%" border=0 rules="none" frame="void" 135 cols="2" cellspacing="0" cellpadding="0"> 136<tr valign="top" align="left"> 137<td width="8%"></td> 138<td width="91%"> 139<p><b>tiffdump</b>(1), <b>tiffgt</b>(1), <b>tiffinfo</b>(1), 140<b>libtiff</b>(3)</p> 141<!-- INDENTATION --> 142<p>Libtiff library home page: 143<b>http://www.simplesystems.org/libtiff/</b></p> 144</td> 145</table> 146<hr> 147</body> 148</html> 149