Localized Gamma Correction

1. What is meant by gamma correction?
2. How is gamma correction calculated?
3. What is inverse gamma correction?
4. What is gamma correction in printing?

What is meant by gamma correction?

Gamma correction is the application of a function that transforms brightness or luminance values. Gamma functions are usually nonlinear but monotonic and designed to affect the highlights (whitest values), midtones (grayscale), and shadows (dark areas) separately.

How is gamma correction calculated?

Gamma correction is sometimes specified in terms of the encoding gamma that it aims to compensate for — not the actual gamma that is applied. For example, the actual gamma applied with a "gamma correction of 1.5" is often equal to 1/1.5, since a gamma of 1/1.5 cancels a gamma of 1.5 (1.5 * 1/1.5 = 1.0).

What is inverse gamma correction?

Blind inverse gamma correction, which automatically determines a proper restoration gamma value from a given image, is of paramount importance to attenuate the distortion.

What is gamma correction in printing?

Gamma correction is a built-in printer feature that allows users to adjust the lightness/darkness level of their prints. The amount of correction is specified by a single value rang- ing from 0.0 to 10.0.