These programs compress and uncompress 8 bit image files using delta
modulation. The compressed file contains the difference of each byte
from the previous one, coded in a single nibble. I tried the delta
modulation programs, compress and pack on a 256 * 256 * 8 gray scale
picture of me. The results were the following:
Original 65536
/bin/pack 59660
/usr/ucb/compress 53510
deltac 40489
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