DELTAC
Section: Local Commands (L)
Updated: 7 June 1990
Index
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NAME
deltac, deltau - compress and expand using delta modulation
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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- DIAGNOSTICS
-
- AUTHOR
-
- SEE ALSO
-
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