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<html>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>THUMBNAIL</title>
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</head>
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THUMBNAIL
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NAME
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SYNOPSIS
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DESCRIPTION
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OPTIONS
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BUGS
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SEE ALSO
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NAME
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cols="2" cellspacing="0" cellpadding="0">
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thumbnail − create a <small>TIFF</small> file with
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thumbnail images
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SYNOPSIS
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cols="2" cellspacing="0" cellpadding="0">
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thumbnail [ options ] input.tif
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output.tif
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DESCRIPTION
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cols="2" cellspacing="0" cellpadding="0">
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thumbnail is a program written to show how one
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might use the SubIFD tag (#330) to store thumbnail images.
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thumbnail copies a <small>TIFF</small> Class F
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facsimile file to the output file and for each image an
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8-bit greyscale thumbnail sketch. The output file
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contains the thumbnail image with the associated
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full-resolution page linked below with the SubIFD tag.
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By default, thumbnail images are 216 pixels wide by 274
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pixels high. Pixels are calculated by sampling and filtering
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the input image with each pixel value passed through a
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contrast curve.
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OPTIONS
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cols="5" cellspacing="0" cellpadding="0">
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−w
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Specify the width of thumbnail images in pixels.
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−h
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Specify the height of thumbnail images in pixels.
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−c
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Specify a contrast curve to apply in generating the
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thumbnail images. By default pixels values are passed
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through a linear contrast curve that simply maps the pixel
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value ranges. Alternative curves are: exp50 for a 50%
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exponential curve, exp60 for a 60% exponential curve,
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exp70 for a 70% exponential curve, exp80 for a
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80% exponential curve, exp90 for a 90% exponential
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curve, exp for a pure exponential curve,
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linear for a linear curve.
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BUGS
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cols="2" cellspacing="0" cellpadding="0">
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There are no options to control the format of the saved
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thumbnail images.
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SEE ALSO
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cols="2" cellspacing="0" cellpadding="0">
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tiffdump(1), tiffgt(1), tiffinfo(1),
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libtiff(3)
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Libtiff library home page:
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http://www.remotesensing.org/libtiff/
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</body>
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</html>
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