How My Images Are Dithered • Hacker News Board

Re: How My Images Are Dithered

#11

Post by Isamu » Sat, Jul 25, 2026, 1:58 PM UTC

Retr0id wrote: post #2

I suppose it is a type of dithering, but really this is Halftoning

Yes, which of course is still cool. Probably the main point.

Re: How My Images Are Dithered

#12

Post by ipunchghosts » Sat, Jul 25, 2026, 2:01 PM UTC

Why is this not a typical data augmentation method for training deep networks? It would allow the networks to learn invariants that's align with humans. Currently, I suppose none of these dithered images would be correctly classified.

Re: How My Images Are Dithered

#13

Post by iTokio » Sat, Jul 25, 2026, 2:09 PM UTC

xnx wrote: post #10

Title here is missing "How" as in "How My Images Are Dithered"

That’s a hn filter to avoid clickbait titles I think

Re: How My Images Are Dithered

#14

Post by gausswho » Sat, Jul 25, 2026, 2:14 PM UTC

iTokio wrote: post #13

xnx wrote: post #10

Title here is missing "How" as in "How My Images Are Dithered"

That’s a hn filter to avoid clickbait titles I think

My Title Was Dithered

Re: How My Images Are Dithered

#15

Post by gausswho » Sat, Jul 25, 2026, 2:15 PM UTC

I vaguely recall stumbling across a site years ago that could do something like this in the browser, with various bits 'n bobs you could poke at. Can't find it now.

Re: How My Images Are Dithered

#16

Post by willmeyers » Sat, Jul 25, 2026, 2:16 PM UTC

Cool effect! It feels a bit like a deep-fried meme to me, but that might just be me!

I tried doing something similar a couple of years ago and gave up after running into the exact same issues in the post. It's really difficult to replicate proper halftoning on a computer screen without getting moiré patterns and weird artifacts because of PPI, aliasing, and other stuff. Beyond that, print and screens are just fundamentally different ways of rendering things.

Re: How My Images Are Dithered

#17

Post by Dwedit » Sat, Jul 25, 2026, 2:16 PM UTC

Speaking of which, are there any good ways to undither images? Things like GIMP FFT are not perfectly reversible.

Re: How My Images Are Dithered

#18

Post by trollbridge » Sat, Jul 25, 2026, 2:17 PM UTC

Dwedit wrote: post #17

Speaking of which, are there any good ways to undither images? Things like GIMP FFT are not perfectly reversible.

No, although AI gets really close. Dithering represents adding noise to an image and also represents doing a lossy type of compression.

Re: How My Images Are Dithered

#19

Post by trollbridge » Sat, Jul 25, 2026, 2:18 PM UTC

ipunchghosts wrote: post #12

Why is this not a typical data augmentation method for training deep networks? It would allow the networks to learn invariants that's align with humans. Currently, I suppose none of these dithered images would be correctly classified.

I’m sorry, but I can’t understand what you’re saying at all. Explain?

Re: How My Images Are Dithered

#20

Post by dahart » Sat, Jul 25, 2026, 2:19 PM UTC

ValdikSS wrote: post #4

??? This is halftoning, not dithering

I’d say halftoning is a specific type of dithering. Wikipedia mentions that for print, some people consider the terms synonymous.

https://en.wikipedia.org/wiki/Dither#Applications