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That's either done by hand or with some clever stippling algorithm. Unless there's some new feature in PS I'm not aware of (highly likely) I can't think of a way to do that natively.
I'm kind of curious to know myself, because I could use that.
You can do similar with some really old school filters, but something about those dots are quite random. The PS filters crank out a halftone screen based on angles and dot sizes, and are way more uniform.
What I've done is convert image to grayscale, and then to Bitmap. In the Bitmap box, select Halftone Screen and play with those settings. Once again, it won't be exactly what you're showing, but it is an approximation.
Ah! I remember coming across this a while ago, and if memory serves, the author was [somewhat rightfully] being a bit protective of his art*, but there's a download link there now too.
* I may well be mixing this up with something I came across on imgur at some point,
Voronoroi, mmmmm... That's great detrius, perfect!
It has a max of 10,000 dots. Unfortunately I need 100,00 dots at least...
Ok, I was holding off from posting this, which i had to dig through wayback machine to find, but if you can handle the slog, perhaps of use?
I really want to find something along these lines for myself as I'd ge a LOT of use out of it.
Perhaps I should've finished that P5.js tutorial I started last week... :\
- Links on Wayback's copy of the project page (inc. a Windows exe, annoyingly) are all fucked. Only usable stuff I can find is on the github so far.detritus
- all of this is very interesting, and that stippling is brilliant, but how does a numpty get it to work? the blurb on these web pages means nothing to me...hans_glib
- yeah. my problem too! So far options are:
- ...or trying to hack existing code into something like Processing.detritus
the program vectoraster is possible for something like this but you'd probably have to create a gradient in photoshop and then pick the right variables to get it to look just this way.
it's handy tho for dot pattern stuff
Not exactly the same, but try this:
(Bump up the resolution for best results)
Make your artwork a mask on a black layer, so that the image goes from black to transparent.
Set that layer's blend mode to Dissolve, and lower the opacity down to like 10% so there are a lot of gaps between the dots.
Now go to channels and ctrl click the RGB channel to select its transparency. (assuming a white background).
Make that selection a mask on another black layer, and apply a black stroke effect to the layer. Now you can adjust the stroke width to control the dot size.
Would be nice if you could automate the first part to adjust density, but I can't think how.
aka Stochastic. Injects printers use it. the closest out-of-the-box approximation in photoshop is Diffusion Dither (it's resolution dependent so you'll need to play with it).
back in the day it was the RIP software that produced the desired screen. Stochastic was one of the choices.