| thumbnail - create a TIFF file with thumbnail images |
| thumbnail [ options ] input.tif output.tif |
| 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. 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. |
| -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. |
| There are no options to control the format of the saved thumbnail images. |
| tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3) |