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ppm2tiff converts a file in the PPM,
PGM and PBM image formats to
TIFF. By default, the TIFF
image is created with data samples packed
(PlanarConfiguration=1), compressed with the Packbits
algorithm (Compression=32773), and with each strip no
more than 8 kilobytes. These characteristics can be
overridden, or explicitly specified with the options
described below
If the PPM file contains greyscale data,
then the PhotometricInterpretation tag is set to 1
(min-is-black), otherwise it is set to 2 (RGB).
If no PPM file is specified on the command
line, ppm2tiff will read from the standard input.
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