AWARE [SYSTEMS] Imaging expertise for the Delphi developer
AWare Systems, Imaging expertise for the Delphi developer, Home Extension TIFF Tag T4Options

TIFF Tag Reference

TIFF Tag Reference
TIFF Tag Search

Extension TIFF Tags

Previous Tag
Next Tag

Contact

Information: info@awaresystems.be
Helpdesk: support@awaresystems.be
Sales: sales@awaresystems.be



Valid HTML 4.01!



TIFF Tag T4Options

IFDImage
Code292 (hex 0x0124)
NameT4Options
LibTiff nameTIFFTAG_GROUP3OPTIONS
TypeLONG
Count1
Default0 (basic 1-dimensional coding)

Description

Options for Group 3 Fax compression

This field is made up of a set of 32 flag bits. Unused bits must be set to 0. Bit 0 is the low-order bit.

The specification defines these bits:

Bit 0 is 1 for 2-dimensional coding (otherwise 1-dimensional is assumed). For 2-D coding, if more than one strip is specified, each strip must begin with a 1-dimensionally coded line. That is, RowsPerStrip should be a multiple of Parameter K, as documented in the CCITT specification.
Bit 1 is 1 if uncompressed mode is used.
Bit 2 is 1 if fill bits have been added as necessary before EOL codes such that EOL always ends on a byte boundary, thus ensuring an EOL-sequence of 1 byte preceded by a zero nibble: xxxx-0000 0000-0001.

LibTiff defines these bits as follows:

GROUP3OPT_2DENCODING = 1;
GROUP3OPT_UNCOMPRESSED = 2;
GROUP3OPT_FILLBITS = 4;