diff options
Diffstat (limited to 'graphics/jpeg_ls/DESCR')
| -rw-r--r-- | graphics/jpeg_ls/DESCR | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/graphics/jpeg_ls/DESCR b/graphics/jpeg_ls/DESCR new file mode 100644 index 00000000000..f7d883f126e --- /dev/null +++ b/graphics/jpeg_ls/DESCR @@ -0,0 +1,25 @@ +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. |