adobe rgb color space adobe wide gamut rgb color space cmyk color model central america chrominance color model color space coloroid hexachrome histogram equalization image processing international commission on illumination japan lms color space list of color spaces and their uses munsell color system ntsc natural color system north america osa-ucs pal pantone prophoto rgb color space quadrature amplitude modulation rgb color model rgb color space ryb color model secam srgb scrgb color space xvycc ycbcr ydbdr ypbpr yuv