| 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 |
Version 1
| Filter Control Parameter | Type | Default Value | Available Values | Description |
|---|---|---|---|---|
| COMPRESSION | WORD | BTR_COMP_G3 | BTR_COMP_G3BTR_COMP_G3_2D | Compression for saving. |
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.