Full Name | JBIG2 (bilevel image compression) |
Format ID | IG_FORMAT_JB2 = 62 |
File Extension(s) | *.jb2 |
Data Type | Raster Image |
Data Encoding | Binary |
Color Profile Support | No |
Multi-Page Support | Yes |
Alpha Channel Support | No |
ImageGear Platforms Support | WIN32 |
To support the JBIG 2 format, attach the ImageGear JBIG2 Component to Core ImageGear. See Attaching Components.
N/A
Filter Control Parameter | Type | Default Value | Available Values | Description |
---|---|---|---|---|
JBIG2_FILE_ORG | INT | IG_JB2_FILEORGDISTRIBUTED = 0 |
|
This function specifies the file format generated by the encoder.
JBIG2 files may be organized in two ways; by sequential access or by random access.
The second organization permits a decoder to determine all the segment dependencies without reading the entire file. Sequential organization is suitable for transmitting images through a network - page by page. Random access organization is used for quick access to each page in an image. |
The JBIG2 format supports multi-page images and is the most effective compression method for bitonal (B\W) images. JBIG2 Format Filter supports some features of bitonal file processing. These features are determined by IG_FLTR_ flags. This Format Filter also allows you to save JBIG2 images with different compressions depending of image bit depth.
JBIG2 is a highly-compressed black and white image format that uses symbol recognition and substitution for very good compression results. Any black and white image can be compressed using JBIG2 including images stored as Group 4, Group 3, MO:DCA, TIFF, PDF and others.
The JBIG2 compression algorithm searches for groups of pixels arranged in similar shapes and use them to define a symbol. Rather than retaining information on the placement of each pixel, a table is created for common symbols. This allows users to see incredible reductions in file sizes. Compression rate matches 100:1 compared to uncompressed black and white TIFFs.