Huh, right up my alley... a while back I was playing with trying to turn photos into sketches ( https://hachyderm.io/@bazzargh/109928618521729073 https://hachyd

Huh, right up my alley... a while back I was playing with trying to turn photos into sketches ( https://hachyderm.io/@bazzargh/109928618521729073 https://hachyderm.io/@bazzargh/109928618521729073 ); one of the effects I found really noticeable with my super-naive approach was that it tended to overemphasise very dark areas in a way we don't see. Then last week I saw this, which also does some fill in shading (but, using ML)-worth the click, it's a project that makes it appear as if paper held over an object causes it to be sketched...but in fact it's all post-processing... https://www.youtube.com/watch?v=vArIkzYtW6I https://www.youtube.com/watch?v=vArIkzYtW6I This got me back to wondering about the shading problem, and I ended up down a rabbithole reading papers like https://www.yorku.ca/rfm/pub/2021annrev.pdf https://www.yorku.ca/rfm/pub/2021annrev.pdf (review article on state of the art), https://www.frontiersin.org/articles/10.3389/fpsyg.2022.915672/full#B35 https://www.frontiersin.org/articles/10.3389/fpsyg.2022.9156... (recent markov model, with links to code) about lightness and brightness perception, and how our mental model of how the scene is lit can explain a bunch of optical illusions. While I was going for a charcoal effect, this approach https://openprocessing.org/sketch/486307 https://openprocessing.org/sketch/486307 - scribble using brightness as 'gravity' on the pen - is pretty nice. Anyhoo, I'm not going to critique the article, because I'm a total amateur just doing this for fun, but it _is_ fun, and very satisfying when you get the computer to draw something that looks hand drawn instead of just a sobel filter.