Hold down the mouse button to draw. Press Q or E to change what color you have selected to edit the levels for it, and press left and right arrows to actually change the levels of the colors.
I saw this project: https://scratch.mit.edu/projects/62594298/#player and wanted to make a pen project based off of a system inside it. Specifically, I wanted to make a set pen color to (r, g, b) block, but I still need to figure out how it works.
