RGB Colors

You can mix red, green, and blue to create colors. As it was with grayscale, each component gets a value between 0 and 255. fill(255, 255, 0); Fill with three parameters sets a red-green-blue color. This one is yellow. fill(0, 255, 255, 200); Fill with four parameters sets a RGB-color with transparency. This one is a little bit tansparent cyan. background(255,0,0); Covers the whole canvas with the specified color. This one is red. You can turn off fill and stroke with noStroke(); and noFill();. strokeWeight(1); sets the thikness of outlines.

Try out fill, background, noStroke, noFill, and strokeWeight to color the sketch below: