5.2.6.10 Gamma Correction

Imaging devices have non-linear characteristics, but the transfer function is approximated by a power function. The intensity of each of the linear RGB components is transformed to a non-linear signal through the use of the gamma correction submodule. The power function is approximated by using the four 256-entry Color LUT. The table values are programmable through the User Interface when the CLUT mode and gamma correction are disabled (CLUTEN and GAM fields of the Configuration register 1 of the layer are cleared), or by the DMA as described in Color Look-Up Table Configuration. Each ARGB component input value can be associated with the gamma corrected value written in the CLUT.