Effects Screen Concepts Back to index... This app has two special effects. The first effect is to turn the image into a silhouette. This effect removes the green and turns the rest of the image black. The second effect will blur the background. This can make the foreground look more dramatic. Warning: the blur effect can be very time consuming. You need to be patient to see the final result. Controls: Silhouette Choice - turns the silhouette effect on and off Blur Background Slider- this slider will determine how much the background is blurred