Patent ID: 8077259

Claim:
A video signal converter for converting a primary video signal composed of luminance signals of each primary color (RGB) that may obtain a signal value within an extended range partially including an output range from a predetermined output lower limit value to an output upper limit value, into a secondary video signal, as a video signal to be input into a prescribed video display means, and composed of luminance signals of each primary color (RGB) that may obtain a value in the output range, comprising: an interim luminance value calculating means for calculating interim luminance values of each primary color (RGB), by conducting a first complementary color conversion processing for setting the output lower limit value to a signal value of a primary color having a primary signal minimum value when the primary signal minimum value as a minimum value among the luminance signal values of each primary color (RGB) in the primary video signal is less than the output lower limit value, and at the same time, for setting a value obtained by adding a positive complementary value proportional to a difference between the output lower limit value and the primary signal minimum value to signal values of two primary colors other than the primary signal minimum value in the primary video signal, and a secondary video signal producing means for producing the secondary video signal composed of signals having values obtained by converting the interim luminance values of each of the primary colors (RGB) into values within the output range in accordance with a predetermined conversion rule, when the interim luminance values of each primary color (RGB) include a value greater than the output upper limit value; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the interim luminance values of each primary color (RGB) do not include a value greater than the output upper limit value.