Image files that employ JPG compression are commonly called 'JPG files' and are stored in variants of the JIF image format. The CR2 takes over from Canon's previous format - CRW and is used by the Canon 350D, 1D, G9, and 20D models. RAW files are the best quality to size ratio that a photograph can be stored in, primarily because each color is recorded in either 12 or 14 bits, and lossless compression is used. JPG typically achieves 10:1 compression with little perceptible loss in image quality. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPG is a commonly used method of lossy compression for digital images, particularly those produced by digital photography. If you tried to do this with JPEG, this would be difficult and likely result in a quality loss. You can choose to store your pictures in RAW format, which gives you the benefit of doing a lot of post-processing on the file. Instead, it is used to store information directly coming from the sensor. This does not contain a ready-to-view picture like a JPG or PNG file. The Canon RAW version 2 (cr2) format is a RAW format created by Canon for storing digital images.

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