- Extension
- .pgm
- .rb
- Format
- Binary
- Text
- Category
- Raster Image
- Ebook
- Developer
- Jef Poskanzer
- NuvoMedia
- 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.
- RB is an eBook file format that was developed by NuvoMedia. It was first used in Nuvo Media’s Rocket eBook device. It contains the contents of the book in HTML form.
- MIME Type
- image/x-portable-graymap
- application/x-rocketebook
