By far the best proof is experience.  

Sir Francis Bacon (1561 - 1626)


Offset is just the same as the brightness control on your TV. It is a positive DC offset of the image signal. It is used primarily to set the level of black. Generally speaking, for the best signal, the black level should be set so that it is near zero (but not below zero) on the histogram. Increasing the brightness beyond this point just lightens the image but without improving the image data. 

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