thumbnail - create a TIFF file with thumbnail images
thumbnail [options] input.tif output.tif
The thumbnail command shows how to 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 grayscale 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.
The following options are supported:
-c Specify a contrast curve to apply when generating the thumbnail images. By default, pixel values are passed through a linear contrast curve that simply maps the pixel value ranges. Alternative curves are as follows:
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
-h Specify the height of thumbnail images in pixels.
-w Specify the width of thumbnail images in pixels.
The following operands are supported:
input.tif The name of the input TIFF file.
output.tif The name of the output file.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE ATTRIBUTE VALUE Availability SUNWTiff Interface stability Evolving
tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)
There are no options to control the format of the saved thumbnail images.
Updated by Breda McColgan, Sun Microsystems Inc., 2004.
|SunOS 5.11||thumbnail (1)||26 Mar 2004|