Options for JBIG data. 0x87BE ∙ 34750

IG_ISIS_TAG_JBIGOPTIONS allows an application to determine or specify various options when working with a JBIG data source.

Type:

IG_ISIS_TAG_TYPE_BYTE

Drivers:

Drivers for scanners that are capable of generating JBIG files, PIXFPACK.

Values:

IG_ISIS_TAG_JBIGOPTIONS consists of 20 bytes that comprise the JBIG header, and have the following values:

Byte	Value	Meaning
0	0	Reserved. (Used for progressive JBIG only 1.)
1	0	Reserved. (Used for progressive JBIG only.)
2	1	Number of planes.
3	0	Always zero.
4-7	Pixels	(Motorola format.)
8-11	Lines	(Motorola format.)
12-15	LinesPerStrip	(Motorola format.)
16	Typically 8	Maximum Adaptive Template pixel horizontal movement
17	Typically 0	Maximum Adaptive Template pixel vertical movement
18	0	Progressive mode ordering. (Not used.)
19	Bit 7 = 0	Always zero.
19	Bit 6	1 = Two-line template; 0 = Three-line template
19	Bit 5 = 0	(Used in progressive JBIG.)
19	Bit 4 = 0	(Used in progressive JBIG.)
19	Bit 3	1 = Typical prediction on; 0 = Typical prediction off.
19	Bit 2 = 0	(Used in progressive JBIG.)
19	Bit 1 = 0	(Used in progressive JBIG.)
19	Bit 0 = 0	(Used in progressive JBIG.)

Remarks:

Use IG_ISIS_TAG_JBIGOPTIONS to set or read the JBIG header when working with a scanner capable of delivering JBIG data. JBIG compression is currently only available when using a Fujitsu 3099 scanner to produce JBIG data. This data can be written to a TIFF file, but cannot be uncompressed, converted to another compression format.

Information on progressive JBIG will be provided when drivers exist that support it.