HyperDither uses an elegant color reduction (dithering) routine to turn color or grayscale images into black and white or grayscales. The visual effect produced by this technique creates rich, velvety tones, and is higher-quality than the “Diffusion Dither” method offered by Photoshop.
HISTORY:
In the early 1980s, while developing the graphics technology for the first Macintosh, Bill Atkinson (HyperCard, QuickDraw, MacPaint) discovered a very elegant filter to convert greyscale image data for display on the Mac's 1-bit black-and-white screen.
Later, this graphics routine was implemented as an option in Apple’s HyperScan software, connecting early Macs to flatbed scanners, and nowhere else. HyperScan and the excellent Atkinson dithering routine were subsequently unavailable for many years—but not forgotten!
SUPPORTS:
• macOS 10.14 (Mojave) or later
• Dark mode support
From Tinrocket, award-winning creator of apps to inspire creativity: Waterlogue, This by Tinrocket, and Olli by Tinrocket.
• Apple Silicon support
• UI fixes
• Update support URL
If you like HyperDither, please consider leaving an App Store review or rating—we’d really appreciate it! Every review counts and helps indie developers like ourselves. :)
We’re here to help you, too: If you have a question or need assistance, you can always email us at [email protected]
Thanks again!
Waterlogue: Watercolor Camera 
Olli by Tinrocket 
Percolator: Dazzling Mosaics 