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author | rodent <rodent@pkgsrc.org> | 2013-04-07 20:49:31 +0000 |
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committer | rodent <rodent@pkgsrc.org> | 2013-04-07 20:49:31 +0000 |
commit | 56d0e89eec7a65cd783aaecd29fefde7b20f7a96 (patch) | |
tree | 79de035a23bbb285c8713b492fa4fa499634f7f8 /graphics/ljpeg | |
parent | 836f824b7f7339847cc2cb57f6c10401a6122132 (diff) | |
download | pkgsrc-56d0e89eec7a65cd783aaecd29fefde7b20f7a96.tar.gz |
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.
Diffstat (limited to 'graphics/ljpeg')
-rw-r--r-- | graphics/ljpeg/DESCR | 46 |
1 files changed, 20 insertions, 26 deletions
diff --git a/graphics/ljpeg/DESCR b/graphics/ljpeg/DESCR index b1a152d2e8d..dabb3ca6f4e 100644 --- a/graphics/ljpeg/DESCR +++ b/graphics/ljpeg/DESCR @@ -1,30 +1,24 @@ -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. - +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. + 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. +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. |