Astro Hacker News - Dithering with CSS

tnelsond4 |next [-]

If we could get jbig2 native support in browsers we could do monochrome black and white images at ridiculously small file sizes.

A page of sheet music can be as small as 8kb. I'm using a wasm decoder right now, but I could forsee using css filters after the fact to make it look less sharp and aliased

tiborsaas |next |previous [-]

This is CSS dithering with "SVG backend" doing the heavy lifting by utilizing the feComposite filter

https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/E...

rpastuszak |next |previous [-]

I’ve messed with a similar idea here: https://untested.sonnet.io/notes/just-some-innocent-gradient...

(The linked web app doesn’t work on mobile in portrait mode, sorry!)

The biggest issue with this trick is that different engines calculate the filters differently, thus turning an okay-ish image into something that looks like a glitch.

nextlevelwizard |next |previous [-]

Is this actually dithering?

I have dabbled with some dithering algorithms and while this is way faster than my naive js implementations, this looks pretty bad

IshKebab |root |parent [-]

Yes it is dithering. Unusual dithering though - I don't see why it is coloured. Is this intended for printers?

heftig |root |parent [-]

The image gets de-saturated but the noise that's mixed in is colored. This looks like a mistake.

I think the noise is also way too 'soft'. At high frequencies it just becomes near-uniform gray so it barely affects the thresholding.

ramon156 |next |previous [-]

Is this what they use at schools before they hand it over to the printer? /j

skrebbel |root |parent |next [-]

I recommend lookscanned.io if you need a similar effect for legal reasons

marvinblum |root |parent |previous [-]

Exactly what I thought. Work sheets used to look like this if they have been copies of copies of copies...

kelsolaar |next |previous [-]

It feels and looks like threshold-quantized Perlin rather than actual proper dithering. Cool stuff that said!

binaryturtle |next |previous [-]

I have to admit I don't think it's visually very appealing like that. It looks more like some sort of error/ glitch. Maybe my old Firefox does it weirdly?

AntiUSAbah |previous [-]

The image quality is so bad, I don't get it?