RetroMacCast

Where great old Macs live again!

An old school Tron tank, just in time for the release of the new movie. 512 x 342 - Sized for compact Macs. Use Graphic Converter to change from .gif to a StartupScreen. Created with HyperDither 1.2 and Graphic Converter

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Views: 107

Comment by Claes on December 18, 2010 at 3:24pm

Nice!

Comment by Timbotronik on December 18, 2010 at 10:24pm

Have you guys discussed this HyperDither software before? I had never heard of it before you started posting these pics. I'm absolutely floored by the quality of the dither patterns.  I took a peek at their website and the software has some interesting history:

 

http://www.tinrocket.com/software/hyperdither/

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.

 

Fascinating!!! --tim

Comment by John on December 19, 2010 at 7:43am

I thought we mentioned it once. I'll look into it and if not we'll do so. Yea, I'm amazed by how much better it is than error diffusion. I thought it was really cool of Bill Atkinson to send the guy info on his technique, and a boon to all of us.

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