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Gamma correction in computers is used, for example, to display a gamma = 1.8 Apple picture correctly on a gamma = 2.2 PC monitor by changing the image gamma. Another usage is equalizing of the individual color-channel gammas to correct for monitor discrepancies.
On Linux and BSD operating systems, Redshift supports multiple monitors through the X extensions RandR (preferred) or VidMode, or through the Direct Rendering Manager. Because Redshift can only be configured to use the same gamma correction on all monitors it controls, it is usually desirable to run one instance of the program per monitor.
A color profile file for a monitor will typically contain two parts: [8] The VCGT/LUT part, which does white point correction, and is applied to the screen as a whole. The gamma+matrix part, which does gamma/hue/saturation correction, and has to be applied by individual color-managed applications.
The software aims at being simpler than GIMP, [5] is an alternative to Paint.NET and is also similar to Paintbrush. [6] [7] Rendering is done with antialiasing and gamma correction. [8] It can read/write usual image formats [9] and interoperate with other layered editors via OpenRaster format.
Often a step called linearization is performed first, to undo the effect of gamma correction that was done to get the most out of limited 8-bit color paths. Instruments used for measuring device colors include colorimeters and spectrophotometers. As an intermediate result, the device gamut is described in the form of scattered measurement data.
Gamma correction is particularly useful for bringing details that would be hard to see on most computer monitors out of shadows. In some image editing software, this is called "curves", usually, a tool found in the color menu, and no reference to "gamma" is used anywhere in the program or the program documentation.
Viggiano found that white balancing in the camera's native RGB color model tended to produce less color inconstancy (i.e., less distortion of the colors) than in monitor RGB for over 4000 hypothetical sets of camera sensitivities. [10] This difference typically amounted to a factor of more than two in favor of camera RGB.
This establishes the current offsets in color display. Depending on the calibration software and type of monitor used, the software either creates a correction matrix (i.e. an ICC profile) for color values before being sent to the display or gives instructions for altering the display's brightness/contrast and RGB values through the OSD.