- Extension
- .g4
- .ppm
- Format
- Binary
- Text
- Category
- Fax
- Raster Image
- Developer
- Computer Fax Systems (CFS)
- Jef Poskanzer
- 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.
- A PPM file is a 24-bit color image formatted using a text format. It stores each pixel with a number from 0 to 65536, which specifies the color of the pixel. PPM files also store the image height and width, whitespace data, and the maximum color value.
- MIME Type
- image/g4fax
- image/x-portable-pixmap
