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Devine Lu Linvega's posts Post Back to profile
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@neauoire If you feel like experimenting with threshold maps, here's an 8-bit variation of interleaved gradient noise:

noise(x, y) = (142 * x + 79 * y) & 255

Should be trivial to implement in uxn, no?

The top shows a short program, to be precise a JavaScript noise function that return a number between zero and 255, based on x and y input. It multiplies x by 142, y by 79, and returns the modulo 256 value of their sum. x and y are presumed to be integers. The bottom shows a so-called noise map, pixels in varying shades of gray indicating a value between zero (black) and 255 (white). This maps represents which value was returned by the described noise function when the x and y coordinates of the pixels are used as input. The distribution of dark and light pixels is fairly even, and while some hatching patterns can be spotted they are relatively subtle. This makes it a good threshold map for dithering purposes.
2 Jul 2023 at 10:28 | Wall-to-wall | Open on vis.social
4 comments
Devine Lu Linvega

@vanderZwan yeah that's an easy one to port :) have you tried it?

2 Jul 2023 at 15:14 | Open on merveilles.town
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@neauoire if you mean in uxn, no, because I wouldn't know how to load an arbitrary image file. If you have some pointers to how to make a CLI that can read an image file and then create a new one, this could be a neat first attempt at a uxn rom for me actually :).

If you mean trying it out for dithering in general, then yes: I have an ObservableHQ notebook that has it as one possible noise map. It also experiments with mixing it with a sharpening filter:

observablehq.com/d/8e32d923e41

@neauoire if you mean in uxn, no, because I wouldn't know how to load an arbitrary image file. If you have some pointers to how to make a CLI that can read an image file and then create a new one, this could be a neat first attempt at a uxn rom for me actually :).

If you mean trying it out for dithering in general, then yes: I have an ObservableHQ notebook that has it as one possible noise map. It also experiments with mixing it with a sharpening filter:

2 Jul 2023 at 16:05 | Open on vis.social
Devine Lu Linvega

@vanderZwan yeah, I meant in uxn, it'd be a good way to break into it, it's a pretty straight forward project to implement. There's lots of image parsing code around that you could base yourself on if you wanted to give it a try :)

2 Jul 2023 at 16:07 | Open on merveilles.town
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@neauoire I'll have a look around and maybe give it a shot!

But I'm saying this in an "explicitly *not* calling dibs on this"-manner, because I have a six month old and I know I have no spare time for creative coding for a while anyway ;)

2 Jul 2023 at 16:23 | Open on vis.social
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