HyperDither is an OS X image processing utility that converts color or grayscale images to 1 bit black & white using a sophisticated dithering routine. Specifically, HyperDither implements the ?Atkinson? dithering filter.
Years ago, during the development of the first Macintosh, Bill Atkinson (of HyperCard, QuickDraw, MacPaint & now nature photography fame) discovered 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 as an option in Apple’s long-lost HyperScan software (A HyperCard stack with some XCMDs/XFCNs) that would connect an early Mac 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!
Version 1.2: - Implemented batch processing. Batch processing also works with drag and drop: drag a folder of image into the main window; you will be prompted for a save location.
- New keyboard shortcut to clear the main window (Command-Delete)
- Can now have multiple HyperDither windows
- Image scrolling now works when the window view is zoomed
- Removed QuickTime Graphics export options when saving images; PNG is now the default file type for all save and batch operations.
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