Creates a stipple picture from the image store in the "image' list. If you'd like to change the picture: Scan your own 45x60 image and import into this project using: https://scratch.mit.edu/projects/66980580/ Next idea: decode vector to an angle, use colour wheel to paint according to angle...
Tweaked to random select one of R, G, or B instead of grey. It adjusts the intensity of that color so that it matches the perceptual grey value of the original pixel, ie performs the reverse calculation of the RGB->grey formula but only applies it to one channel. (Also I think fewer and bigger stipple dots would work better! - still to do...)
