gamma correction - meaning and definition. What is gamma correction
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What (who) is gamma correction - definition

TECHNICAL TERM
Gamma characteristic; Video gamma; Gamma Correction; Gamma balance; Gamma compression; Gamma curve; Gamma corrected; Gamma correct; CRT gamma; Camera gamma; LUT gamma; Display gamma; Viewing gamma; Gamma value
  • Characteristic curve of a [[photographic film]]. The slope of its linear section is called the gamma of the film.
  • The effect of gamma correction on an image: The original image was taken to varying powers, showing that powers larger than 1 make the shadows darker, while powers smaller than 1 make dark regions lighter.
  • Gamma correction test image. Only valid at browser zoom = 100%
  • Plot of the [[sRGB]] standard gamma-expansion nonlinearity in red, and its local gamma value (slope in log–log space) in blue. The local gamma rises from 1 to about 2.2.

gamma correction         
<hardware> Adjustments applied during the display of a digital representation of colour on a screen in order to compensate for the fact that the Cathode Ray Tubes used in computer monitors (and televisions) produce a light intensity which is not proportional to the input voltage. The light intensity is actually proportional to the input voltage raised to the inverse power of some constant, called gamma. Its value varies from one display to another, but is usually around 2.5. Because it is more intuitive for the colour components (red, green and blue) to be varied linearly in the computer, the actual voltages sent to the monitor by the display hardware must be adjusted in order to make the colour component intensity on the screen proportional to the value stored in the computer's display memory. This process is most easily achieved by a dedicated module in the display hardware which simply scales the outputs of the display memory before sending them to the digital-to-analogue converters. More expensive graphics cards and workstations (particularly those used for CAD applications) will have a gamma correction facility. In combination with the "white-point" gamma correction is used to achieve precise colour matching. {Robert Berger's explanation of monitor gamma (http://cs.cmu.edu/afs/cs.cmu.edu/user/rwb/www/gamma.html)}. [{"Digital Imaging in C and the World Wide Web", W. David Schwaderer (http://itknowledge.com/)}]. (1999-02-01)
Gamma correction         
Gamma correction or gamma is a nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems. Gamma correction is, in the simplest cases, defined by the following power-law expression:
Color correction         
  • Chromaticity diagram, Planckian locus, and lines of constant CCT
PROCESS USED IN STAGE LIGHTING, PHOTOGRAPHY, TELEVISION, CINEMATOGRAPHY, AND OTHER DISCIPLINES, WHICH USES COLOR GELS, OR FILTERS, TO ALTER THE OVERALL COLOR OF THE LIGHT
Colour correction; Color correction filter; Color Temperature Orange; Correct To Orange; Color-correction filter; Color correction gel; Color-correction gel
Color correction is a process used in stage lighting, photography, television, cinematography, and other disciplines, which uses color gels, or filters, to alter the overall color of the light. Typically the light color is measured on a scale known as color temperature, as well as along a light yellow –light blue axis orthogonal to the color temperature axis.

Wikipedia

Gamma correction

Gamma correction or gamma is a nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems. Gamma correction is, in the simplest cases, defined by the following power-law expression:

V out = A V in γ , {\displaystyle V_{\text{out}}=AV_{\text{in}}^{\gamma },}

where the non-negative real input value V in {\displaystyle V_{\text{in}}} is raised to the power γ {\displaystyle \gamma } and multiplied by the constant A to get the output value V out {\displaystyle V_{\text{out}}} . In the common case of A = 1, inputs and outputs are typically in the range 0–1.

A gamma value γ < 1 {\displaystyle \gamma <1} is sometimes called an encoding gamma, and the process of encoding with this compressive power-law nonlinearity is called gamma compression; conversely a gamma value γ > 1 {\displaystyle \gamma >1} is called a decoding gamma, and the application of the expansive power-law nonlinearity is called gamma expansion.