summaryrefslogtreecommitdiff
path: root/graphics/ljpeg
AgeCommit message (Collapse)AuthorFilesLines
2009-10-29Support DESTDIR and PKGMANDIRtnn3-12/+15
2009-06-14Remove @dirrm entries from PLISTsjoerg1-3/+1
2006-06-15Drop maintainership, I don't use them any longer.wiz1-2/+2
2005-04-11Remove USE_BUILDLINK3 and NO_BUILDLINK; these are no longer used.tv1-2/+1
2005-02-24Add RMD160 digestsagc1-1/+2
2004-12-03Rename ALL_TARGET to BUILD_TARGET for consistency with other *_TARGETs.wiz1-2/+2
Suggested by Roland Illig, ok'd by various.
2004-05-23malloc.h fixes for darwin, plus a handful of other small fixes fordanw2-1/+8
problems found after fixing malloc problems
2004-04-18Convert to bl3.wiz1-2/+2
2004-01-20Move WRKSRC definition away from the first paragraph in a Makefile.agc1-2/+2
2003-12-21Initial import of ljpeg-1.0 (from pkgsrc-wip):wiz5-0/+116
In 1992, a joint ISO/CCITT committee known as JPEG (Joint Photographic Experts Group) established and published the first draft international standard (DIS) for compressing continuous-tone still images, both grayscale and color. JPEG has defined four mode of operations, summarized them as follows. (1) Sequential encoding: each image component is encoded in a single left-to-right, top-to-bottom scan; (2) Progressive encoding: the image is encoded in multiple scans for applications in which transmission time is long, and the viewer prefers to watch the image build up in multiple coarse-to-clear passes; (3) Lossless encoding: the images is encoded to guarantee exact recovery of every source image sample value (even though the result is low compression compared to the lossy modes); (4) Hierarchical encoding: the image is encoded at multiple resolutions so that lower-resolution versions may be accessed without first having to decompress the image at its full resolution. Our lossless JPEG encoding program has an automatic prediction selection value (PSV) selector which selects the best PSV among a user provided or default set of PSVs. This selector guarantees the best compression ratio for lossless JPEG. The encoding program "pnmtoljpg" compresses a Portable Pixmap or Portable Graymap image to a lossles JPEG (ljpg) image using the JPEG standard (DIS) lossless mode of operation. The decoding program "ljpgtopnm" decodes a ljpg image to either a Portable Pixmap or Portable Graymap image depending on the number of color components stored in the ljpg image file.