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<title>THUMBNAIL</title>

THUMBNAIL

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

BUGS

SEE ALSO

NAME

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thumbnail − create a <small>TIFF</small> file with

thumbnail images

SYNOPSIS

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thumbnail [ options ] input.tif

output.tif

DESCRIPTION

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thumbnail is a program written to show how one

might use the SubIFD tag (#330) to store thumbnail images.

thumbnail copies a <small>TIFF</small> Class F

facsimile file to the output file and for each image an

8-bit greyscale thumbnail sketch. The output file

contains the thumbnail image with the associated

full-resolution page linked below with the SubIFD tag.

By default, thumbnail images are 216 pixels wide by 274

pixels high. Pixels are calculated by sampling and filtering

the input image with each pixel value passed through a

contrast curve.

OPTIONS

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−w

Specify the width of thumbnail images in pixels.

−h

Specify the height of thumbnail images in pixels.

−c

Specify a contrast curve to apply in generating the

thumbnail images. By default pixels values are passed

through a linear contrast curve that simply maps the pixel

value ranges. Alternative curves are: exp50 for a 50%

exponential curve, exp60 for a 60% exponential curve,

exp70 for a 70% exponential curve, exp80 for a

80% exponential curve, exp90 for a 90% exponential

curve, exp for a pure exponential curve,

linear for a linear curve.

BUGS

       cols="2" cellspacing="0" cellpadding="0">

There are no options to control the format of the saved

thumbnail images.

SEE ALSO

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tiffdump(1), tiffgt(1), tiffinfo(1),

libtiff(3)

Libtiff library home page:

http://www.remotesensing.org/libtiff/