Bill Atkinson Interview
Leo Laporte has a great two-part, three-hour interview with Bill Atkinson that covers a wide range of subjects.
Update (2016-05-03): Tinrocket (via Buzz Andersen):
In the early 1980s, while developing the graphics technology for the first Macintosh, Bill Atkinson (HyperCard, QuickDraw, MacPaint) discovered a very elegant filter to convert greyscale image data for display on the Mac's 1-bit black-and-white screen.
[…]
HyperDither is an OS X app that uses an elegant color reduction (dithering) routine to turn color or grayscale images into 1-bit black and white. The visual effect produced by this technique creates rich, velvety tones, and is higher-quality than the “Diffusion Dither” method used by Photoshop.
Tanner Helland (via Cabel Sasser):
Atkinson’s formula is a bit different from others in this list, because it only propagates a fraction of the error instead of the full amount. This technique is sometimes offered by modern graphics applications as a “reduced color bleed” option. By only propagating part of the error, speckling is reduced, but contiguous dark or bright sections of an image may become washed out.
I just talked with Atkinson yesterday and told him his dithering is in the Accelerate framework.
kvImageConvert_DitherAtkinson
