Anyone know what is the difference between gamma and exposure? And what is the difference between gamma correction and exposure adjustment in image processing?
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Anyone know what is the difference between gamma and exposure? And what is the difference between gamma correction and exposure adjustment in image processing?
Gamma correction is a non-linear global function that compresses certain ranges in your image. It is mainly used in order to be more efficient from human vision point of view, in fixed point format. It is absent in raw files, but exists in JPEG. Each pixel undergoes the following transformation:
Exposure is a physical phenomenon in your camera. Exposure adjustment on the other hand is linear global function. It is used mainly in order to compensate for lack or excess of exposure in the camera: