JBIG

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JBIG
File extension: .jbg, .jbig
MIME type: image/jbig
Developed by: ISO, IEC, ITU-T
Type of format: Image file formats
Extended to: JBIG2

JBIG is a lossless image compression standard from the Joint Bi-level Image Experts Group, standardized as ISO/IEC standard 11544 and as ITU-T recommendation T.82. Now that the newer bi-level image compression standard JBIG2 has been released, JBIG is also known as JBIG1. JBIG was designed for compression of binary images, particularly for faxes, but can also be used on other images. In most situations JBIG offers between a 20% and 50% increase in compression efficiency over the Fax Group 4 standard, and in some situations, it offers a 30-fold improvement.

JBIG uses a form of arithmetic coding patented by IBM known as the Q-coder. It bases the probabilities of each bit on the previous bits and the previous lines of the picture. In order to allow compressing and decompressing images in scanning order, it does not reference future bits. JBIG also supports progressive transmission with small (around 5%) overheads.

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Multimedia compression formats
Video compression formats
ISO/IEC
MPEG-1 · MPEG-2 · MPEG-4 · MPEG-4/AVC		 ITU-T
H.261 · H.262 · H.263 · H.264		 Others
AVS · Bink · Dirac · Indeo · MJPEG · RealVideo · Theora · VC-1 · VP6 · VP7 · WMV
Audio compression formats
ISO/IEC MPEG
MPEG-1 Layer III (MP3) · MPEG-1 Layer II · AAC · HE-AAC		 ITU-T
G.711 · G.722 · G.722.1 · G.722.2 · G.723 · G.723.1 · G.726 · G.728 · G.729 · G.729.1 · G.729a		 Others
AC3 · Apple Lossless · ATRAC · FLAC · iLBC · Monkey's Audio · μ-law · Musepack · Nellymoser · RealAudio · SHN · Speex · Vorbis · WavPack · WMA
Image compression formats
ISO/IEC/ITU-T
JPEG · JPEG 2000 · lossless JPEG · JBIG · JBIG2 · PNG  · WBMP		 Others
APNG  · BMP · GIF · ILBM · PCX · TGA · TIFF · HD Photo
Media container formats
General
3GP · ASF · AVI · DMF · DPX · FLV · Matroska · MP4 · MXF · NUT · Ogg · Ogg Media · QuickTime · RealMedia · VOB		 Audio only
AIFF · AU · WAV
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