- Extension
- .pgm
- .hrz
- Format
- Binary
- Binary
- Category
- Raster Image
- Raster Image
- Developer
- Jef Poskanzer
- Slow Scan Television Group
- Description
- A PGM file is a grayscale image file saved in the portable gray map (PGM) format and encoded with one or two bytes (8 or 16 bits) per pixel. It contains header information and a grid of numbers that represent different shades of gray from black (0) to white (up to 65,536). PGM files are typically stored in ASCII text format, but also have a binary representation.
- This is the display format associated with the broadcast of slow-scan television. This legacy format was used to transmit a static image given limited bandwidth through the use of specialized software.
- MIME Type
- image/x-portable-graymap
- image/x-pict
