Patent ID: 8169389

Claim:
A method of converting a three-or-more-color-component image input signal to an image output signal for controlling a display device, the method comprising: acquiring the image input signal including a plurality of pixel signals, each pixel signal comprising three or more color components; determining respective residual differences for each color component of each pixel signal, the determining respective residual differences comprising: determining a minimum panel intensity value for each color component of each pixel; subtracting the minimum panel intensity values from respective color component panel intensity values; and subtracting panel intensity offset values from corresponding color component panel intensity values, where values obtained from subtracting the panel intensity offset values that are less than zero (0) are set to equal zero (0); determining a limit value of the residual differences, the limit value comprising a maximum value among the determined respective residual differences; calculating a common scale factor for each of the color components, based upon the limit value, the common scale factor comprising the lesser of: an inverse of the limit value; and a maximum common scale factor comprising a maximum intensity value for a white color component; and applying the common scale factor to the image input signal to produce the image output signal.