1<!-- Creator : groff version 1.19.2 --> 2<!-- CreationDate: Mon Jan 2 17:41:54 2006 --> 3<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 4"http://www.w3.org/TR/html4/loose.dtd"> 5<html> 6<head> 7<meta name="generator" content="groff -Thtml, see www.gnu.org"> 8<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 9<meta name="Content-Style" content="text/css"> 10<style type="text/css"> 11 p { margin-top: 0; margin-bottom: 0; } 12 pre { margin-top: 0; margin-bottom: 0; } 13 table { margin-top: 0; margin-bottom: 0; } 14</style> 15<title>THUMBNAIL</title> 16 17</head> 18<body> 19 20<h1 align=center>THUMBNAIL</h1> 21 22<a href="#NAME">NAME</a><br> 23<a href="#SYNOPSIS">SYNOPSIS</a><br> 24<a href="#DESCRIPTION">DESCRIPTION</a><br> 25<a href="#OPTIONS">OPTIONS</a><br> 26<a href="#BUGS">BUGS</a><br> 27<a href="#SEE ALSO">SEE ALSO</a><br> 28 29<hr> 30 31 32<a name="NAME"></a> 33<h2>NAME</h2> 34 35 36<p style="margin-left:11%; margin-top: 1em">thumbnail 37− create a <small>TIFF</small> file with thumbnail 38images</p> 39 40<a name="SYNOPSIS"></a> 41<h2>SYNOPSIS</h2> 42 43 44 45<p style="margin-left:11%; margin-top: 1em"><b>thumbnail</b> 46[ <i>options</i> ] <i>input.tif output.tif</i></p> 47 48<a name="DESCRIPTION"></a> 49<h2>DESCRIPTION</h2> 50 51 52 53<p style="margin-left:11%; margin-top: 1em"><i>thumbnail</i> 54is a program written to show how one might use the SubIFD 55tag (#330) to store thumbnail images. <i>thumbnail</i> 56copies a <small>TIFF</small> Class F facsimile file to the 57output file and for each image an 8-bit greyscale 58<i>thumbnail sketch</i>. The output file contains the 59thumbnail image with the associated full-resolution page 60linked below with the SubIFD tag.</p> 61 62<p style="margin-left:11%; margin-top: 1em">By default, 63thumbnail images are 216 pixels wide by 274 pixels high. 64Pixels are calculated by sampling and filtering the input 65image with each pixel value passed through a contrast 66curve.</p> 67 68<a name="OPTIONS"></a> 69<h2>OPTIONS</h2> 70 71 72<table width="100%" border=0 rules="none" frame="void" 73 cellspacing="0" cellpadding="0"> 74<tr valign="top" align="left"> 75<td width="11%"></td> 76<td width="3%"> 77 78 79 80<p style="margin-top: 1em" valign="top"><b>−w</b></p> </td> 81<td width="8%"></td> 82<td width="78%"> 83 84 85<p style="margin-top: 1em" valign="top">Specify the width 86of thumbnail images in pixels.</p></td> 87<tr valign="top" align="left"> 88<td width="11%"></td> 89<td width="3%"> 90 91 92 93<p style="margin-top: 1em" valign="top"><b>−h</b></p> </td> 94<td width="8%"></td> 95<td width="78%"> 96 97 98<p style="margin-top: 1em" valign="top">Specify the height 99of thumbnail images in pixels.</p></td> 100<tr valign="top" align="left"> 101<td width="11%"></td> 102<td width="3%"> 103 104 105 106<p style="margin-top: 1em" valign="top"><b>−c</b></p> </td> 107<td width="8%"></td> 108<td width="78%"> 109 110 111<p style="margin-top: 1em" valign="top">Specify a contrast 112curve to apply in generating the thumbnail images. By 113default pixels values are passed through a linear contrast 114curve that simply maps the pixel value ranges. Alternative 115curves are: <b>exp50</b> for a 50% exponential curve, 116<b>exp60</b> for a 60% exponential curve, <b>exp70</b> for a 11770% exponential curve, <b>exp80</b> for a 80% exponential 118curve, <b>exp90</b> for a 90% exponential curve, <b>exp</b> 119for a pure exponential curve, <b>linear</b> for a linear 120curve.</p> </td> 121</table> 122 123<a name="BUGS"></a> 124<h2>BUGS</h2> 125 126 127<p style="margin-left:11%; margin-top: 1em">There are no 128options to control the format of the saved thumbnail 129images.</p> 130 131<a name="SEE ALSO"></a> 132<h2>SEE ALSO</h2> 133 134 135 136<p style="margin-left:11%; margin-top: 1em"><b>tiffdump</b>(1), 137<b>tiffgt</b>(1), <b>tiffinfo</b>(1), <b>libtiff</b>(3)</p> 138 139<p style="margin-left:11%; margin-top: 1em">Libtiff library 140home page: <b>http://www.remotesensing.org/libtiff/</b></p> 141<hr> 142</body> 143</html> 144