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Here's an app that you don't see every day. I always find myself adjusting the display brightness when I wake up, and then forget to turn it down through at least half the night. Staring at this white screen I don't really know what kind of impact my eyes are going to suffer in a few years. Yet, I still do it. The only relief is knowing that I'm not alone in doing this. Proof? Now there's an app for just that!

While straitened circumstances in the banking industry might mean the suits eat more sandwiches at the desk, the rule remains that there is no such thing as a free lunch.

HyperDither is an OS X image processing utility that converts color or grayscale images to 1 bit black & white using a sophisticated dithering routine. Way back in the early days of Macintosh, Bill Atkinson (of HyperCard, QuickDraw, MacPaint & nature photography fame) developed a very elegant dithering filter to convert greyscale image data to the 1 bit black & white Mac video display. The dithering produced by this routine was much higher quality than the now-a-days ubiquitous Floyd-Steinberg or "Error-diffusion" filter (used by QuickTime, PhotoShop).

The dither matrix was implemented an option in Apple's HyperScan software (A HyperCard stack with some XCMDs/XFCNs) that would connect to a flatbed scanner. HyperScan, and hence the most-excellent Atkinson dithering routine, has been unavailable for many, many years-but not forgotten! I was able to email Bill Atkinson in January, 2003 and inquire about the details of the algorithm; he was kind enough to respond with a brief write up of the routine-15 minutes later I had it up and running.
It's taken a few spare afternoons since 2003 to pack everything into a nice little application with documentation and an icon-better late than never!

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