Apply old-school monochrome dithering algorithms to images
Small utility to create stylised monochrome images from your photos. Includes techniques used by old Mac OS and the Gameboy Camera.
This was just a little side-project, it's not been tested, it took a day to build - it works for me on a PixelXL, and it's known to work on a HTC One M7 - but there's no support for any issues you might find.