OPEN BUGS
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1: Cannot decode 16-bit images.
2: Converts images with depth lower than 8 into 8-bit images.
   (This takes place in COMPONENT-VALUE).


FIXED BUGS
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3: If the :OUTPUT-FILE keyword argument to DECODE-FILE or DECODE-STREAM
   is a pathname, the PNM file is written to the file "pgm" or "ppm".