HyperDither
HyperDither
1.3

4.7

HyperDither free download for Mac

HyperDither

1.3
19 February 2011

Convert images to 1-bit black and white.

Overview

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 Mac, 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!

What's new in HyperDither

Version 1.3:
  • 12.5%, 25% & 50% reduced views
  • Optimized PNG export -- tiny, loss-less files!
  • Several redraw bugs related to the view menu have been fixed.

11 HyperDither Reviews

See all

Rate this app:

macroxx-ultra
07 October 2007

Most helpful

This is a great program with very nice results and I hope, that "The Future" features, which are mentioned in the ReadMe file are going to be implemented soon. :-)
Like (1)
Version 1.1
jkesler
27 May 2016
Works great :) Can copy and paste back and forth from photoshop as part of a design workflow. Very pleasant dithering results.
Like
Version 1.3
Bottacco
30 April 2015
Good quality results and batch processing is a live saver… and it still works like a charm under Yosemite!
Like
Version 1.3
Cooper_Stan
22 February 2011
Simple, easy in use and fast!
Like (1)
Version 1.3
Moog-Modular
08 October 2008
I use vers 1.1 to convert photos to b/w laser engravings. But my laser app reads only pict files, not pngs. So while I appreciate the continued work on this application, it just upgraded itself out of my ability to use it.
Like
Version 1.2
Garlicbreath
01 May 2008
Used to be able to select black and white as the color space for the saved file, which saved about half the file size when saving as PNG. Better for emailing. Now files are saved as 32-bit/millions of colors. Can this be changed?
Like (1)
Version 1.2
Dalahast
02 March 2008
YES YES YES! I used HyperDither when it first came out and I've been waiting and waiting for an update, thanks much!
Like (1)
Version 1.2
macroxx-ultra
07 October 2007
This is a great program with very nice results and I hope, that "The Future" features, which are mentioned in the ReadMe file are going to be implemented soon. :-)
Like (1)
Version 1.1
Dlwormwood
14 August 2006
Man, the nostalgia that this app brings back is luciously painful. HyperCard was what attracted me to the Mac in the first place, and I really missed the culture the Macsphere had in those days. This app perfectly recaptured the "monochrome" asethetic that early Mac apps had. I can see this app used to make web pages and Flash apps to reclaim the 1-bit retro look.
Like
Version 1.0.1
Ancientyger
13 August 2006
It's pretty fast, at least on smaller images. I wish this were an Image Unit for Core Image aware applications, with advanced controls. This would, then, be amazing.
Like
Version 1.0.1
Suzres
13 August 2006
very nice, simple, robust. It is a pleasure to find again the very subtil black and white of Atkinson algorythm.
Like
Version 1.0.1
Free

4.7

App requirements: 
  • Intel 32
  • PPC 32
  • Mac OS X 10.3.9 or later
Developer Website: 
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