BTR

Full Name	Brooktrout
Format ID	IG_FORMAT_BRK = 3
File Extension(s)	.brk, .301,
Data Type	Raster image
Data Encoding	Binary
Color Profile Support	No
Multi-Page Support	No
Alpha Channel Support	No
ImageGear Platforms Support	WIN32, WIN64, Unix, Unix64, MAC, .NET, .NET64

ImageGear Supported Versions:

Version 1

ImageGear Supported Features:

IG_FLTR_DETECTSUPPORT - autodetect
IG_FLTR_PAGEREADSUPPORT - single page file reading
IG_FLTR_PAGEINSERTSUPPORT - single-page file writing

ImageGear Read Support:

IG_COMPRESSION_CCITT_G3 - Indexed RGB: 1 bpp
IG_COMPRESSION_CCITT_G32D - Indexed RGB: 1 bpp

ImageGear Write Support:

IG_COMPRESSION_CCITT_G3 - Indexed RGB: 1 bpp
IG_COMPRESSION_CCITT_G32D - Indexed RGB: 1 bpp

When saving an image, the image must have horizontal resolution of 200 DPI and vertical resolution of 100 or 200 DPI.

ImageGear Filter Control Parameters:

Filter Control Parameter	Type	Default Value	Available Values	Description
COMPRESSION	WORD	BTR_COMP_G3	BTR_COMP_G3BTR_COMP_G3_2D	Compression for saving.

Comments:

A Brooktrout file consists of a CCITT Group 3 (G3) compressed file with a 128-byte header designed by Brooktrout Technology. The header fields include a constant that identifies the file as Brooktrout, a version number, the horizontal and vertical resolutions of the image in dots/mm, the number of bits per pixel, and the number of pixels per line.