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 facsimile 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. 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