Abstract: A device for regulating the luminance signal and chromanance signals of a video image to be converted into red, green and blue color signals. The device includes a conversion matrix and a device for regulating an amplitude of the luminance signal, the blue color difference chromanance signal and a red color difference chromanance signal to be modified by a user adjustment control. The device further includes a device for preventing the color signal having the highest value at the output of the conversion matrix from being able to exceed a saturation value substantially equal to a percentage, preferably 70%, of the white level of the image signal when the color signal reaches the saturation value.