ShapeFilter
ShapeFilter applies a "shapeburst" gradient to an image. It uses the alpha channel of the image to determine the shape and then shades from the outside of the shape inwards. You can change the shape of the gradient between linear, circle up, circle down and a smooth transition and you can change the rate at which the gradient changes. By default, the gradient will shade from black at the edges to white in the centre of the shape, but you can also get the filter to invert this. This filter is particularly useful for creating bump maps for the LightFilter. You can apply a colormap for the gradient which can produce interesting effects especially for bump maps.
ShapeFilter