Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :
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A simple demonstration of the use of a probability matrix to select from two candidate colours. In this case, both colours contribute equally to the initial input colour. The normalised threshold matrix value at for a given pixel is compared against the cumulative probability of each candidate.
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