a scale factor which may be 1 u03b4 and u03b3 are real numbers u03c6 is an offset angle which may be 0 and n is a free parameter a point is selected wherever n assumes an integral value from e g 0 to n p u2212 1 the resulting set of points constitutes a spiral lattice in the constant luminance plane the chrominance index of each point is e g the value of n at that point those skilled in the art will appreciate that both the radial coordinate and the angular coordinate can be subsumed into a complex valued coordinate z given by z sn u03b4 e j 2 u03b1n u03b3 u03c6 where j 2 u2212 1 although an adequate color palette can be obtained with the scale factor s set to 1 and the offset angle u03c6 set to 0 either or both of these can be set to other values the scale factor can be adjusted for finer or coarser sampling of the colors in the plane the offset angle can be adjusted for example to assure that points rather than interstices of the spiral lattice fall at colors of particular importance when the exponent u03b4 is set to u00bd the resulting spiral lattice covers the plane uniformly that is averaged over.