IADLXDisplayGamma

The IADLXDisplayGamma interface configures gamma correction on a display.

The IADLXDisplayGamma interface provides two types of gamma correction which are gamma ramp and gamma coefficient. Both gamma ramp and gamma coefficient have two sub-types: de-gamma and re-gamma.

• Gamma ramp provides a Lookup Table (LUT) for the gamma correction, it applies the LUT with the assumption that all pixels are in sRGB space.

• Re-Gamma coefficient uses the following non-linear formula:

  Copied!

  if (linear_pixel < CofficientA0)
       output = linear_pixel * CofficientA1
  else
       output = (1 + CofficientA3) * linear_pixel ^ (1/Gamma) - CofficientA2

• De-Gamma coefficient uses the following non-linear formula:

  Copied!

  if (linear_pixel < CofficientA0)
       output = linear_pixel / CofficientA1
  else
       output = ((linear_pixel + CofficientA3) / (1 + CofficientA2)) ^ (Gamma)