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  • License: Freeware
  • Last update: 6 years ago
  • Total downloads: 96
  • Price: Free |
  • Operating system: Mac OS X
  • Publisher: tinrocket.com
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mac default iconHyperDither For Mac Publisher's description

HyperDither is an OS X image processing utility that converts color or grayscale images to 1 bit black & white ...

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 for 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 routine was implemented as an option in Apple’s long-gone 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 and he was kind enough to respond with a brief write up of the routine.

To process an image with HyperDither, just drag & drop or copy & paste the image into the HyperDither’s main window. You can then save it to disk or copy it back to the clipboard.

To batch-process a folder of images, just drag the folder into HyperDither’s main window.

What's New in This Release:

* 12.5%, 25% & 50% reduced views
* Optimized PNG export -- tiny, loss-less files!
* Several redraw bugs related to the view menu have been fixed.

System Requirements:

PPC / Intel, Mac OS X 10.3 or later
Program Release Status: Minor Update
Program Install Support: Install and Uninstall

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