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authorrodent <rodent@pkgsrc.org>2013-04-07 20:49:31 +0000
committerrodent <rodent@pkgsrc.org>2013-04-07 20:49:31 +0000
commit56d0e89eec7a65cd783aaecd29fefde7b20f7a96 (patch)
tree79de035a23bbb285c8713b492fa4fa499634f7f8 /graphics/ljpeg
parent836f824b7f7339847cc2cb57f6c10401a6122132 (diff)
downloadpkgsrc-56d0e89eec7a65cd783aaecd29fefde7b20f7a96.tar.gz
Edited DESCR in the case of:
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-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.