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Gamma: All photographs have a characteristic called gamma. The amount of gamma present in an image is measured as the contrast that affects the mid-level grays (the mid tones) of an image. The good news for digital imagers is that this gamma is adjustable by most image-enhancement programs, and you aren’t stuck with the gamma that is present in the original negative or print.

Gamma Adjustment: An adjustment that makes the Tonal Distribution lighter or darker. A Gamma Adjustment may be made to a monitor, a scanner or to an image during the scanning or image editing process.

Gamma Correction: To provide for a linear transfer characteristic from input to output device
Variable Gamma =color and B&W