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locks; strict;
comment	@# @;


1.2
date	2013.04.07.20.49.35;	author rodent;	state Exp;
branches;
next	1.1;

1.1
date	2003.12.21.21.29.08;	author wiz;	state Exp;
branches
	1.1.1.1;
next	;

1.1.1.1
date	2003.12.21.21.29.08;	author wiz;	state Exp;
branches;
next	;


desc
@@


1.2
log
@Edited DESCR in the case of:
 File too long (should be no more than 24 lines).
 Line too long (should be no more than 80 characters).
 Trailing empty lines.
 Trailing white-space.
Trucated the long files as best as possible while preserving the most info
contained in them.
@
text
@This software package contains an implementation of JPEG-LS, the emerging
lossless/near-lossless compression standard for continuous-tone images being
developed by ISO/IEC JTC1/SC29/WG1 (draft document FCD14495 as of November
1997). The names of the executables in the software package derive from the
acronym LOCO, as the core of the new standard is based on the LOCO-I algorithm
(LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard
Laboratories (reference: M. Weinberger, G. Seroussi, G. Sapiro, "LOCO-I: A Low
Complexity, Context-Based, Lossless Image Compression Algorithm," Proc. IEEE
Data Compression Conference, Snowbird, Utah, March-April 1996).

The term "near-lossless compression" refers to a lossy algorithm for which each
decompressed image sample differs from the corresponding original image sample
by not more than a pre-specified value, the (usually small) "loss." Lossless
compression corresponds to loss=0. Even though the term "continuous-tone image"
refers in principle to any image whose components have more than one bit per
sample, palletized images may require a reordering of the color palette for best
compression results using LOCO-I on the array of color indices. This
functionality is not implemented in the present software, although it is
supported by the new standard, and is easy enough to implement with the tools
given. Notice, however, that LOCO-I and JPEG-LS were not designed, and might not
give optimal performance, for images that have been palletized through
dithering.
@


1.1
log
@Initial revision
@
text
@d1 9
a9 11
This software package contains an implementation of JPEG-LS, the
emerging lossless/near-lossless compression standard for continuous-tone
images being developed by ISO/IEC JTC1/SC29/WG1 (draft document
FCD14495 as of November 1997). The names of the executables in the
software package derive from the acronym LOCO, as the core of the
new standard is based on the LOCO-I algorithm (LOw COmplexity
LOssless COmpression for Images) developed at Hewlett-Packard
Laboratories (reference: M. Weinberger, G. Seroussi, G. Sapiro,
"LOCO-I: A Low Complexity, Context-Based, Lossless Image Compression
Algorithm," Proc. IEEE Data Compression Conference, Snowbird, Utah,
March-April 1996).
d11 12
a22 13
The term "near-lossless compression" refers to a lossy algorithm
for which each decompressed image sample differs from the corresponding
original image sample by not more than a pre-specified value, the
(usually small) "loss."  Lossless compression corresponds to loss=0.
Even though the term "continuous-tone image" refers in principle
to any image whose components have more than one bit per sample,
palletized images may require a reordering of the color palette
for best compression results using LOCO-I on the array of color
indices. This functionality is not implemented in the present
software, although it is supported by the new standard, and is easy
enough to implement with the tools given. Notice, however, that
LOCO-I and JPEG-LS were not designed, and might not give optimal
performance, for images that have been palletized through dithering.
@


1.1.1.1
log
@Initial import of jpeg_ls-2.2:

This software package contains an implementation of JPEG-LS, the
emerging lossless/near-lossless compression standard for continuous-tone
images being developed by ISO/IEC JTC1/SC29/WG1 (draft document
FCD14495 as of November 1997). The names of the executables in the
software package derive from the acronym LOCO, as the core of the
new standard is based on the LOCO-I algorithm (LOw COmplexity
LOssless COmpression for Images) developed at Hewlett-Packard
Laboratories (reference: M. Weinberger, G. Seroussi, G. Sapiro,
"LOCO-I: A Low Complexity, Context-Based, Lossless Image Compression
Algorithm," Proc. IEEE Data Compression Conference, Snowbird, Utah,
March-April 1996).

The term "near-lossless compression" refers to a lossy algorithm
for which each decompressed image sample differs from the corresponding
original image sample by not more than a pre-specified value, the
(usually small) "loss."  Lossless compression corresponds to loss=0.
Even though the term "continuous-tone image" refers in principle
to any image whose components have more than one bit per sample,
palletized images may require a reordering of the color palette
for best compression results using LOCO-I on the array of color
indices. This functionality is not implemented in the present
software, although it is supported by the new standard, and is easy
enough to implement with the tools given. Notice, however, that
LOCO-I and JPEG-LS were not designed, and might not give optimal
performance, for images that have been palletized through dithering.
@
text
@@