src/tiff/man/thumbnail.1

   1 .\"     $Id: thumbnail.1,v 1.2 2005-11-02 11:07:19 dron Exp $
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   3 .\" Copyright (c) 1994-1997 Sam Leffler
   4 .\" Copyright (c) 1994-1997 Silicon Graphics, Inc.
   5 .\"
   6 .\" Permission to use, copy, modify, distribute, and sell this software and
   7 .\" its documentation for any purpose is hereby granted without fee, provided
   8 .\" that (i) the above copyright notices and this permission notice appear in
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  10 .\" Sam Leffler and Silicon Graphics may not be used in any advertising or
  11 .\" publicity relating to the software without the specific, prior written
  12 .\" permission of Sam Leffler and Silicon Graphics.
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  14 .\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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  16 .\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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  18 .\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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  20 .\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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  25 .if n .po 0
  26 .TH THUMBNAIL 1 "November 2, 2005" "libtiff"
  27 .SH NAME
  28 thumbnail \- create a
  29 .SM TIFF
  30 file with thumbnail images
  31 .SH SYNOPSIS
  32 .B thumbnail
  33 [
  34 .I options
  35 ]
  36 .I input.tif
  37 .I output.tif
  38 .SH DESCRIPTION
  39 .I thumbnail
  40 is a program written to show how one might use the
  41 SubIFD tag (#330) to store thumbnail images.
  42 .I thumbnail
  43 copies a
  44 .SM TIFF
  45 Class F facsimile file to the output file
  46 and for each image an 8-bit greyscale
  47 .IR "thumbnail sketch" .
  48 The output file contains the thumbnail image with the associated
  49 full-resolution page linked below with the SubIFD tag.
  50 .PP
  51 By default, thumbnail images are 216 pixels wide by 274 pixels high.
  52 Pixels are calculated by sampling and filtering the input image
  53 with each pixel value passed through a contrast curve.
  54 .SH OPTIONS
  55 .TP
  56 .B \-w
  57 Specify the width of thumbnail images in pixels.
  58 .TP
  59 .B \-h
  60 Specify the height of thumbnail images in pixels.
  61 .TP
  62 .B \-c
  63 Specify a contrast curve to apply in generating the thumbnail images.
  64 By default pixels values are passed through a linear contrast curve
  65 that simply maps the pixel value ranges.
  66 Alternative curves are:
  67 .B exp50
  68 for a 50% exponential curve,
  69 .B exp60
  70 for a 60% exponential curve,
  71 .B exp70
  72 for a 70% exponential curve,
  73 .B exp80
  74 for a 80% exponential curve,
  75 .B exp90
  76 for a 90% exponential curve,
  77 .B exp
  78 for a pure exponential curve,
  79 .B linear
  80 for a linear curve.
  81 .SH BUGS
  82 There are no options to control the format of the saved thumbnail images.
  83 .SH "SEE ALSO"
  84 .BR tiffdump (1),
  85 .BR tiffgt (1),
  86 .BR tiffinfo (1),
  87 .BR libtiff (3)
  88 .PP
  89 Libtiff library home page:
  90 .BR http://www.remotesensing.org/libtiff/