FR: Atkinson dithering

[Sunspark-007]

Hi, there are many dithering algorithms out there. A nice-to-have would be the Atkinson algorithm which was used on the 1-bit Macintosh computers. It would be a good match for 1-bit e-ink output selection.

function atkinson(pixels,w) {
	const e=Array(2*w).fill(0), m=[0,1,w-2,w-1,w,2*w-1]
	return pixels.map(x => {
		const pix=x+(e.push(0),e.shift()), col=pix>.5, err=(pix-col)/8
		m.forEach(x => e[x]+=err)
		return col
	})
}

Good article on B&W dithering with examples: https://surma.dev/things/ditherpunk/

Web component for html to do Atkinson which might work for you since cr2xt is using a web engine: https://github.com/andrewstephens75/as-dithered-image referred to in https://sheep.horse/2023/1/improved_web_component_for_pixel-accurate_atkinson.html

[CrazyCoder]

Thanks for sharing, I'll consider implementing it.

cr2xt is not using a web engine =)