Lossless JPEG (original) - Revision history

Jsummers: Category:JPEG (organization)

2019-10-16T17:41:55Z

Category:JPEG (organization)

Jsummers: /* Software */

2016-07-26T16:40:50Z

‎Software

Jsummers at 00:29, 6 August 2014

2014-08-06T00:29:00Z

Jsummers at 17:05, 21 November 2013

2013-11-21T17:05:17Z

Jsummers: /* Software */

2013-11-20T00:45:47Z

‎Software

Jsummers at 23:35, 19 November 2013

2013-11-19T23:35:39Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|jpg}}, {{ext|ljpg}}, {{ext|ljpeg}} |locfdd={{LoCFDD|fdd000334}} |released=1992 }} :''See [[Lossless JPEG..."

2013-11-19T23:19:50Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|jpg}}, {{ext|ljpg}}, {{ext|ljpeg}} |locfdd={{LoCFDD|fdd000334}} |released=1992 }} :''See [[Lossless JPEG..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|jpg}}, {{ext|ljpg}}, {{ext|ljpeg}}
|locfdd={{LoCFDD|fdd000334}}
|released=1992
}}
:''See [[Lossless JPEG]] for other uses of the term.''

The original '''lossless JPEG''' (sometimes called '''lossless JPEG-1''') refers to the original [[JPEG]] format when used with lossless compression, instead of the usual lossy compression. It is a standard type of JPEG file, defined in the original JPEG standard (ITU-T Rec. T.81). Few applications support it, though it has found some use in the medical industry, such as in [[DICOM]] files. Note that this format is distinct from [[JPEG-LS]].

A lossless JPEG image may have any bit depth from 2 to 16 bits per sample.

== Identification ==
A lossless JPEG file is identified by the presence of an SOF3, SOF7, SOF11, or SOF15 segment. Refer to [[JPEG]] for a discussion of JPEG segments.

== Specifications ==
* [http://www.w3.org/Graphics/JPEG/itu-t81.pdf ITU-T Rec. T.81]: The JPEG standard

== Software ==
* [https://github.com/thorfdbg/libjpeg Thomas Richter's libjpeg]
* [ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz ljpeg-6b.tar.gz]: Lossless JPEG patch for [http://www.ijg.org/files/jpegsrc.v6b.tar.gz IJG libjpeg 6b] (presumably by Ken Murchison)
* [ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z Lossless JPEG Codec (Cornell University)]: pnmtoljpg, ljpgtopnm

== Sample files ==
* [ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz ljpeg-6b.tar.gz] → testimgl.jpg
* [ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z ljpg.tar.Z] → F-18.ljpg

← Older revision		Revision as of 17:41, 16 October 2019
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	[[Category:JPEG]]		[[Category:JPEG]]
		+	[[Category:JPEG (organization)]]

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 * [http://www.dclunie.com/jpegge.html Stanford PVRG JPEG]
 ** [http://www.cs.unibo.it/~roffilli/pub/JPEGv1.2.1_LINUXport.tgz Linux port] by [http://www.cs.unibo.it/~roffilli/sw.html Matteo Roffilli]
 == Sample files ==

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 :''See [[Lossless JPEG]] for other uses of the term.''
-The original '''lossless JPEG''' (sometimes called '''lossless JPEG-1''') refers to the original [[JPEG]] format when used with lossless compression, instead of the usual lossy compression. It is a standard type of JPEG file, defined in the original JPEG standard (ITU-T Rec. T.81). Few applications support it, though it has found some use in the medical industry, such as in [[DICOM]] files. Note that this format is distinct from [[JPEG-LS]].
+The original '''lossless JPEG''' (sometimes called '''lossless JPEG-1''') refers to the original [[JPEG]] format when used with lossless compression, instead of the usual lossy compression. It is a standard type of JPEG file, defined in the original JPEG standard (ITU-T Rec. T.81). Though few applications support it, it has found some use in the medical industry (see [[DICOM]]), and in some [[Cameras and Digital Image Sensors|raw camera formats]]. Note that this format is distinct from [[JPEG-LS]].
 A lossless JPEG image may have any bit depth from 2 to 16 bits per sample. The compression scheme uses [[Huffman coding]] or [[arithmetic coding]].

← Older revision		Revision as of 23:35, 19 November 2013
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	* [ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz ljpeg-6b.tar.gz] → testimgl.jpg		* [ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz ljpeg-6b.tar.gz] → testimgl.jpg
	* [ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z ljpg.tar.Z] → F-18.ljpg		* [ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z ljpg.tar.Z] → F-18.ljpg
		+
		+	[[Category:JPEG]]

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 * [ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/ljpeg-6b.tar.gz ljpeg-6b.tar.gz]: Lossless JPEG patch for [http://www.ijg.org/files/jpegsrc.v6b.tar.gz IJG libjpeg 6b] (presumably by Ken Murchison)
 * [ftp://ftp.cs.cornell.edu/pub/multimed/ljpg.tar.Z Lossless JPEG Codec (Cornell University)]: pnmtoljpg, ljpgtopnm
 == Sample files ==