Usage
RGB2XYZ(RGBmatrix, illuminant = "D65", observer = 2, RefWhite
= get("XYZperfectreflectingdiffuser", envir = environment()),
RGBModel = "sRGB", RefWhiteRGB = get("whitepointsRGB",
envir =environment()), gamma = NA,
RefWhiteIllum = get("XYZperfectreflectingdiffuser",
envir = environment()), CAT = "Bradford",
CATarray = get("ChromaticAdaptation", envir = environment()))