What is pgm?

The PGM extension, short for Portable Graymap, is a graphic grayscale that has been encoded with 8 or 16 bits per pixel. It contains a grid of numbers that show different shades of gray. This information is commonly stored in an ASCII format. The header information in a PGM file defines the type of the PGM file (A P2 header stands for text and P5 for binary information), the dimensions of a picture and the maximum amount of different shades. Mime type: image/x-portable-graymap, image/x-pgm

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What is crw?

The CRW file is a Raw Image Format that is used by Canon Digital Camera. RAW images contain the data, such as text and condition information in the camera, of the picture that has been taken.

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