Applying the Gamma effect

Gamma is a method of tonal correction that takes the human eye's perception of neighboring values into account. For example, if you were to place a 10 percent gray circle on a black background and an identical gray circle on a white background, the circle surrounded by black appears lighter to the human eye than the circle surrounded by white, even though the brightness values are identical.

Adjusting the midtones lets you increase the detail in a low-contrast image without affecting the shadows or highlights.

Adjusting the midtones lets you increase the detail in a low-contrast image without affecting the shadows or highlights.

The Gamma effect lets you pick up detail in a low contrast drawing without significantly affecting the shadows or highlights. It affects all the values in the drawing but it is curve-based so that the changes are weighted toward the midtones.

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