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 facsim- ile file to the output file and for each image an 8-bit greyscale "thumb- nail 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. Pix- els 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 im- ages. By default pixels values are passed through a linear contrast curve that simply maps the pixel value ranges. Alternative 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 images. SEE ALSO tiffdump (1), tiffgt (1), tiffinfo (1), libtiff (3tiff), AUTHOR LibTIFF contributors COPYRIGHT 1988-2025, LibTIFF contributors 4.7 Sep 11, 2025 THUMBNAIL(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | SEE ALSO | AUTHOR | COPYRIGHT
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