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RAW file format

File extension
File category
In digital photography, the Raw file format is like the negative of conventional photography. The file holds unaltered pixel information captured by the sensors of a digital camera. A digital camera’s memory card can carry the file either in the Raw format or by changing it to JPEG or TIFF format. A particular RAW format does not exist; because each company has produced its own formats altering the characteristics from one camera to another.
Technical details
Raw image files are superior to JPG or PNG since the input is directly from the camera sensors. The integrity of a file is reduced during compression, which can be avoided by using Raw files. Naturally, this leads to Raw files being comparatively larger.
Adobe Photoshop
Apple Preview
Corel Draw