This filter applies a canvas-like effect to the current layer or selection. It textures the image as if it were an artist's canvas.
Your changes are displayed in this preview before being applied to your image.
Direction sets the starting direction of the canvas render. You can also consider that this option gives you the position of the light source which lightens the canvas.
The Depth slider controls the apparent depth of the rendered canvas effect from 1 (very flat) to 50 (very deep).