Wanted to ask if anyone could help me with a coloring page issue I am having. I am using quite thick brushes (eg. 30 pixels plus) and this is going/bleeding beyond the canvas area. I wanted to create a nice clean definition between the canvas (which takes up approx. 1/3 of the centre of the screen) and the rest of the screen without the brush color spilling over. Does anyone have any ideas on how to do this? Many thanks, I really appreciate any tips, guidance on this issue.