1. A method for driving a display unit having more than three color channels per pixel, comprising: mapping a desired color to a set of luminance values, each luminance value being provided for a corresponding one of the color channels; transforming luminance values to intermediate values according to transformation functions selected based on a model for human color perception response; and transmitting the quantized intermediate values over a transmission medium to be received by a receiver capable of recovering and providing the luminance values to the display unit.