johnm@trsvax.UUCP (12/05/88)
I'm looking for information on a specific kind of dithering. Currently I am familiar with and have experimented with: 1) Conventional reduction in resolution (i.e. use four pixels to represent one and thus get five levels of intensity). 2) Noise adding methods (like digital dot diffusion and ordered dithers which don't cut down your resolution but do add fuzziness to the image). 3) Continuous correction methods (like Floyd-Steinberg in which you attempt to make up for errors on previous pixels by altering the intensity of pixels near it). What I want is a method which combines the 1 & 2 (or even better, all three). Suppose I have several intensity levels per pixel already but I want even more. I'm willing to put up with the small amount of noise introduced by type 2 methods but unfortunately can't see how to adapt them to take advantage of multiple color levels. Does anyone have any references or perhaps brief descriptions of methods that combine these or perhaps that take an entirely new tack on the problem? John Munsch