Although you’ll often use the default maximum canvas size to take advantage of the available screen space, you might need to use a smaller or larger size in many circumstances. For instance, if you plan to use the image as a background in a computer game, you might need to use a small canvas size such as 256 by 256.
The strokes wrap around to the opposing side. This feature is useful for creating patterned texture images to be applied to surfaces. When you tile or repeat the image on the surface, the wrapped strokes help make the borders between the images unnoticeable.
This clears existing strokes and turns the canvas black. Before you paint strokes on the black canvas, you may notice that some brushes seem to have no effect. If this occurs, it’s because the paint is black or because it is transparent enough to prevent the color from showing.