1. A method of video processing, comprising: employing a video processor for receiving a RGB color signal comprising RGB of a pixel and its spatial and temporal positions, the received RGB color signal having a first precision; quantizing the RGB color signal into a quantized RGB color signal having a second precision lower than the first precision and a predetermined quantization level as a function of halftoning and luminance preserving quantization (LPQ) by mapping the RGB color signal to a mapped color pixel as a function of a spatially dependent dithering mask threshold and selecting the quantized RGB color signal that minimizes a difference of a luminance of the mapped color pixel and luminance values of predetermined quantized RGB color signals; and outputting the quantized RGB color signal at a quantization level based on the dithering mask threshold.