         self.cieXYZ = CIEXYZColorSpace(white: white)
     }
     @_inlineable
-    public init(white: XYZColorModel, black: XYZColorModel) {
+    public init(white: XYZColorModel, black: XYZColorModel = XYZColorModel(x: 0, y: 0, z: 0)) {
         self.cieXYZ = CIEXYZColorSpace(white: white, black: black)
     }
     @_inlineable

        self.cieXYZ = CIEXYZColorSpace(white: white)
    }
    @_inlineable
    public init(white: XYZColorModel, black: XYZColorModel) {
        self.cieXYZ = CIEXYZColorSpace(white: white, black: black)
    }
    @_inlineable

        self.cieXYZ = CIEXYZColorSpace(white: white)
    }
    @_inlineable
    public init(white: XYZColorModel, black: XYZColorModel = XYZColorModel(x: 0, y: 0, z: 0)) {
        self.cieXYZ = CIEXYZColorSpace(white: white, black: black)
    }
    @_inlineable
