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THUMBNAIL(1) LibTIFF THUMBNAIL(1) NAME thumbnail - create a TIFF file with thumbnail images SYNOPSIS thumbnail [ options ] input.tif output.tif DESCRIPTION thumbnail is a program written to show how one might use the SubIFD tag (#330) to store thumbnail images. thumbnail copies a TIFF Class F fac- simile file to the output file and for each image an 8-bit greyscale "thumbnail sketch" is created. 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 -w width Specify the width of thumbnail images in pixels. -h height Specify the height of thumbnail images in pixels. -c contrast 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. Alter- native curves are: +--------+------------------------+ | Curve | Description | +--------+------------------------+ | exp50 | 50% exponential curve | +--------+------------------------+ | exp60 | 60% exponential curve | +--------+------------------------+ | exp70 | 70% exponential curve | +--------+------------------------+ | exp80 | 80% exponential curve | +--------+------------------------+ | exp90 | 90% exponential curve | +--------+------------------------+ | exp | pure exponential curve | +--------+------------------------+ | linear | linear curve | +--------+------------------------+ BUGS There are no options to control the format of the saved thumbnail im- ages. SEE ALSO tiffdump (1), tiffgt (1), tiffinfo (1), libtiff (3tiff), AUTHOR LibTIFF contributors COPYRIGHT 1988-2022, LibTIFF contributors 4.7 Sep 11, 2024 THUMBNAIL(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | SEE ALSO | AUTHOR | COPYRIGHT
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