Atkinson Dither

Atkinson dithering is an algorithm developed by Apple programmer Bill Atkinson. He is well-known for having created HyperCard and MacPaint, as well as user interface innovations for the Macintosh.

Dither is an intentionally applied form of noise used to randomize quantization error.

A common use of dither is converting a grayscale image to black and white, such that the density of black dots in the new image approximates the average gray-level in the original.

I explore the algorithm below - I'm intrigued by the organic patterns that appear when the image is scaled up. After this I'd like to try the Halftone dither.

It is one of the more profound ironies of the history of thought that the growth of mechanical science, through which arose the idea of mechanism as a possible philosophy of nature, was itself an outcome of the Renaissance magical tradition.
— Frances Yates in The Rosicrucian Enlightenment