This effect/filter creates a greyish embossed relief appearance of the source image.
The effect has keyframes.
Light direction - The direction of the embossing (practically simulating a light source). Value is an angle between 0 and 360 (degrees).
Background lightness - Defines the brightness/lightness of the areas not embossed
Bump height - Defines the thickness of the edges increasing/decreasing the perceived depth of the embossed areas