code: public static Color lerpColor(ColorSet colorSet1, ColorSet colorSet2, double amt) {
           return lerpColor((CMYKColor)CMYKColor.color(colorSet1), (CMYKColor)CMYKColor.color(colorSet2), amt);
      }
docs: Calculates a color or colors between two color at a specific increment.
  
  @param colorSet1
  interpolate from this color
  @param colorSet2
  interpolate to this color
  @param amt
  between 0.0 and 1.0
  
  @return
  The calculated color values.