HyperDither is a REALbasic application that implements the ["Atkinson"
dithering routine][1] as a drag-and-drop Mac OS X application.
The Atkinson routine was originally conceived as the dithering
algorithm in [Bill Atkinson's HyperScan stack][2].
For a Photoshop plugin that applies Atkinson dithering, see
[Dither][3] by Martin Koch.
For macOS 10.15 Catalina support and more dithering options on macOS
10.14 Mojave, see the long awaited [HyperDither 2 on the Mac App
Store][4].
Compatibility
Architecture: PPC x86 (Intel:Mac)
Works on Mac OS X 10.4 through 10.14. Might also work with 10.3.9.
For even earlier Mac OS X versions, HyperDither v1.0.1 is bound to
work as the latest PowerPC-only binary. Reportedly might work as far
back as Mac OS X 10.1 Puma.
[1]:
http://www.tannerhelland.com/4660/dithering-eleven-algorithms-source-code/
[2]:
http://macintoshgarden.org/apps/hyperscan-10
[3]:
https://web.archive.org/web/20160608130043/http://verlagmartinkoch.at/software/dither/index.html
[4]:
https://apps.apple.com/us/app/hyperdither/id1110997147?mt=12