DITHER DITHER is used to specify the plotting behavior of the reflectivity intensities. A value of 0 specifies no dithering, the grid box is completely filled. Values 1-4 increase the number of dither points per grid box, approaching an increasingly opaque value. Dither can be used to overlay image data with radar reflectivity in order to simulate transparency. A dither value >= 5 will outline the grid box.