src/tiff/man/thumbnail.1

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  24 .if n .po 0
  25 .TH THUMBNAIL 1 "November 2, 2005" "libtiff"
  26 .SH NAME
  27 thumbnail \- create a
  28 .SM TIFF
  29 file with thumbnail images
  30 .SH SYNOPSIS
  31 .B thumbnail
  32 [
  33 .I options
  34 ]
  35 .I input.tif
  36 .I output.tif
  37 .SH DESCRIPTION
  38 .I thumbnail
  39 is a program written to show how one might use the
  40 SubIFD tag (#330) to store thumbnail images.
  41 .I thumbnail
  42 copies a
  43 .SM TIFF
  44 Class F facsimile file to the output file
  45 and for each image an 8-bit greyscale
  46 .IR "thumbnail sketch" .
  47 The output file contains the thumbnail image with the associated
  48 full-resolution page linked below with the SubIFD tag.
  49 .PP
  50 By default, thumbnail images are 216 pixels wide by 274 pixels high.
  51 Pixels are calculated by sampling and filtering the input image
  52 with each pixel value passed through a contrast curve.
  53 .SH OPTIONS
  54 .TP
  55 .B \-w
  56 Specify the width of thumbnail images in pixels.
  57 .TP
  58 .B \-h
  59 Specify the height of thumbnail images in pixels.
  60 .TP
  61 .B \-c
  62 Specify a contrast curve to apply in generating the thumbnail images.
  63 By default pixels values are passed through a linear contrast curve
  64 that simply maps the pixel value ranges.
  65 Alternative curves are:
  66 .B exp50
  67 for a 50% exponential curve,
  68 .B exp60
  69 for a 60% exponential curve,
  70 .B exp70
  71 for a 70% exponential curve,
  72 .B exp80
  73 for a 80% exponential curve,
  74 .B exp90
  75 for a 90% exponential curve,
  76 .B exp
  77 for a pure exponential curve,
  78 .B linear
  79 for a linear curve.
  80 .SH BUGS
  81 There are no options to control the format of the saved thumbnail images.
  82 .SH "SEE ALSO"
  83 .BR tiffdump (1),
  84 .BR tiffgt (1),
  85 .BR tiffinfo (1),
  86 .BR libtiff (3)
  87 .PP
  88 Libtiff library home page:
  89 .BR http://www.remotesensing.org/libtiff/