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PGM
Portable Gray Map
Portable Gray Map (PGM) is a file format for grayscale images. It is a lowest common denominator grayscale file format that most image processing programs can read and write.
Main usage
PGM is used for storing images such as X-ray images, medical images, and other scientific images.
- 8-bit grayscale
- 1-bit black and white
- 24-bit RGB color
Main features
JBIG
Joint Bi-level Image experts Group
JBIG is a lossless image compression standard from the Joint Bi-level Image experts Group, designed for bi-level high-resolution image data such as scanned documents. It is best suited for compressing images with large areas of single color or small-scale continuous-tone images.
Main usage
JBIG is mainly used for compressing scanned documents, faxes, and other bi-level images.
- Lossless compression
- High-resolution image data
- Bi-level images