Color conversion apparatus that restricts the color reproduction range of primary color signals

Abstract

The present invention provides color conversion apparatus that prevents overflow in color reproduction, changes in hue, and the deterioration of gradation to improve image quality. The present color conversion apparatus inputs to itself luminance and color difference signals, sets a reference value not less than the maximum level of the luminance signal, converts the luminance and color difference signals into primary color signals, detects the maximum value of the primary color signals for each pixel, lowers the levels of the color difference signals if the maximum value is over the reference value to locate the amplitude of the primary color signals not greater than the reference value. Further, the present color conversion apparatus inputs to itself luminance and color difference signals, sets a reference value not greater than the minimum level of the luminance signal, converts the luminance and color difference signals into primary color signals, detects the minimum value of the primary color signals for each pixel, lowers the amplitudes of the color difference signals if the minimum value is under the reference value to locate the amplitude of the primary color signals not less than the reference value.

Dependencies are inferred from the claim text.