An apparatus for converting input image signals into image signals that
can be displayed in an image display device. The image display device
includes a color space converter converting color components of the input
image signals and color components that can be displayed in the image
display device into color space, a hue control variable calculator
comparing a converted color gamut with each other to calculate a hue
control variable, and a hue controller controlling hues of the input
image signals using the hue control variable.