Bridget Riley (1931 - ) is a leading optical art painter. This effect turns your image into an op-art painting in her style, but with the addition that the contours can follow your original image.
As usual push F8 to experiment with the settings automatically, and double click on the image to set the settings manually. You can choose
|1) ||The frequency of the ondulations across the image.|
|2) ||The amplitude of the ondulations|
|3) ||The color of the ondulations at the top and bottom of the image|
|4) ||The background color, shading or image|
|5) ||How much the original image affects the ondulations|
|6) ||The number of ondulating lines down the image|