- Extension
- .j2k
- .pgm
- Format
- Binary
- Binary
- Category
- Raster Image
- Raster Image
- Developer
- Joint Photographic Experts Group
- Jef Poskanzer
- Description
- Compressed bitmap image that uses wavelet compression instead of the DCT compression used by standard .JPEG images; supports 16-bit color, alpha transparency, and lossless compression.
- 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.
- MIME Type
- image/jp2
- image/x-portable-graymap
