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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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 contain the exact information for every pixel in the image.

Lossy compression like JPEG, trades off all this exact precise data, for smaller sets of instructions on how to reproduce the image. In doing this, some quality is lost, but the total file size is significantly reduced.

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