Halftones is the technique that simulates continuous tone imagery through the use of dots, varying either in size or in spacing, thus generating a gradient like effect. The halftone process is based upon meeting the need for grays through the principle whereby a pattern small enough to be at the eye’s separation threshold will create diffusion on the retina which may convince the eye it is seeing something that is not actually there. Halftones are created through a process called dithering, in which the density and pattern of black and white dots are varied to simulate different shades of gray. Advantages: Reduces costs for photographic designs / Creates the attractive texture of typical screen printing patterns / Can be used to combine two different colors and create a third one.