This is just a demo. It's really helpful though! :) Note that the range of shades in Scratch is slightly smaller than the range of lightness when using HSL, so the dot on the right is somewhat different.
I've been using image scanners more often now, and I just figured out that you can draw an image of each possible hue and shade, then scan it, and get RGB colors in return. Now there's an easy way to convert from hue/shade to RGB! This is especially useful for combining hue with transparent pen, since transparency only works with RGB, and it's hard to generate random RGB colors that look good.
