deltac
SYNOPSIS
deltac nooptions
deltau nooptions
DESCRIPTION
Deltac compresses eight bit data from standard input to the
standard output using delta modulation. Each byte is stored
as four bits if the absolute value of its difference from a
running value is less than 8. This technique has proven to
be more effective than compress(1) or pack(1) for 8 bit grey
level graphics images. It could also work on 24 bit colour
images if each plane is stored separately. For any other
data the size will probably increase.
Deltau reads data compressed produced by deltac from the
standard input and outputs the uncompressed data on standard
output.
DIAGNOSTICS
Both programs will terminate with an error if they fail on
writing on standard output.
AUTHOR
Diomidis Spinellis <dds@cc.ic.ac.uk>
SEE ALSO
compress(1) pack(1)
Man(1) output converted with
man2html