JBIG
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{{FormatInfo | {{FormatInfo | ||
|formattype=electronic | |formattype=electronic | ||
| − | |subcat= | + | |subcat=Compression |
| − | |extensions={{ext|jbg}} | + | |extensions={{ext|jbg}}, {{ext|jbig}}, {{ext|bie}} |
| + | |released=1993 | ||
}} | }} | ||
| − | + | '''JBIG''', also called '''JBIG1''', is a lossless image compression algorithm and data format. The compression algorithm is based on [[arithmetic coding]]. | |
| − | '''JBIG''', also called '''JBIG1''', is a lossless compression algorithm and | + | |
It is named after the organization which developed the format, '''Joint Bi-level Image experts Group'''. | It is named after the organization which developed the format, '''Joint Bi-level Image experts Group'''. | ||
| − | JBIG | + | JBIG is primarily used for bi-level images, but a JBIG codestream may contain multiple image "planes", which can be combined and interpreted as a grayscale image, or even a full color image. |
| + | |||
| + | JBIG works best when contained in some other file format. It can be stored in a file by itself, but that's risky, because the specification does not fully describe how to interpret the colors of the pixels. Reasonably-portable JBIG files are probably limited to bi-level and grayscale, and even then, don't be surprised if black and white get reversed. | ||
== See also == | == See also == | ||
* [[JBIG2]] | * [[JBIG2]] | ||
| + | * [[TIFF-FX]] | ||
== Specifications == | == Specifications == | ||
* [http://www.itu.int/rec/T-REC-T.82 ITU-T Rec. T.82] | * [http://www.itu.int/rec/T-REC-T.82 ITU-T Rec. T.82] | ||
| + | * [http://www.itu.int/rec/T-REC-T.85 ITU-T Rec. T.85] - Defines a subformat ("application profile") of JBIG. | ||
== Software == | == Software == | ||
* [http://www.cl.cam.ac.uk/~mgk25/jbigkit/ JBIG-KIT]: A free C library | * [http://www.cl.cam.ac.uk/~mgk25/jbigkit/ JBIG-KIT]: A free C library | ||
| + | * [[Netpbm]] - Uses a fork of JBIG-KIT. | ||
| + | * [[ImageMagick]] | ||
| − | == | + | == Sample files == |
| + | * https://telparia.com/fileFormatSamples/image/jbig/ | ||
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| + | == Links == | ||
* [[Wikipedia:JBIG|Wikipedia article]] | * [[Wikipedia:JBIG|Wikipedia article]] | ||
* [http://www.jpeg.org/jbig/index.html JBIG Homepage] | * [http://www.jpeg.org/jbig/index.html JBIG Homepage] | ||
| + | * [http://www.fileformat.info/mirror/egff/ch09_07.htm JBIG Compression], from the [[Encyclopedia of Graphics File Formats]] | ||
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| + | [[Category:Graphics]] | ||
Revision as of 18:57, 1 August 2020
JBIG, also called JBIG1, is a lossless image compression algorithm and data format. The compression algorithm is based on arithmetic coding.
It is named after the organization which developed the format, Joint Bi-level Image experts Group.
JBIG is primarily used for bi-level images, but a JBIG codestream may contain multiple image "planes", which can be combined and interpreted as a grayscale image, or even a full color image.
JBIG works best when contained in some other file format. It can be stored in a file by itself, but that's risky, because the specification does not fully describe how to interpret the colors of the pixels. Reasonably-portable JBIG files are probably limited to bi-level and grayscale, and even then, don't be surprised if black and white get reversed.
Contents |
See also
Specifications
- ITU-T Rec. T.82
- ITU-T Rec. T.85 - Defines a subformat ("application profile") of JBIG.
Software
- JBIG-KIT: A free C library
- Netpbm - Uses a fork of JBIG-KIT.
- ImageMagick
