- Extension
- .g4
- .jpc
- Format
- Binary
- Binary
- Category
- Fax
- Raster Image
- Developer
- Computer Fax Systems (CFS)
- Joint Photographic Experts Group
- Description
- Group 4 (G4) used for black and white lossless compression to maintain high-quality images, commonly used in TIFF format compression by fax machines. A picture is seen as black dots and lines on a blank page; the fewer the dots and lines are, the lesser the file size.
- Image format that uses JPEG 2000 advanced wavelet compression; supports color depths of 8, 24, and 32 bits per pixel; also supports grayscale, RGB, YCbCr, XYZ, and Lab color spaces.
- MIME Type
- image/g4fax
- image/jp2
