What exactly is happening to a Raw photo when it becomes a JPEG and what about Raw photos are so preferable for photo editing
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RAW photos are . . . well . . . raw.
Each pixel is a record of the net photons which landed at that particular spot on the sensor. In a photograph that has 100 million pixels, this is a lot of information.
To reduce file sizes, JPEGs replace portions of an image with mathemaic functions that compute approximations of these sections. These functions comsume less data than what they approximate.
Since the jpeg image is a computed reproduction, by definition it is less accurate than its raw source image.
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