additive color adobe rgb color space adobe wide gamut rgb color space black brightness ccmmyk color model color management color model color printing color space color vision coloroid dot gain dots per inch gamut grey component replacement halftone hexachrome international commission on illumination lms color space list of color spaces and their uses munsell color system ntsc natural color system osa-ucs pal pantone primary color printing registration rgb color model rgb color space ryb color model rich black secam srgb scrgb color space serif spot color subtractive color under color addition under color removal witching hour xvycc ycbcr ydbdr yiq ypbpr yuv