Quick Previews: Want to preview the effects that a given PS blending mode will have on an image? You could open a file, make a duplicate layer, and go through the various blending modes. A quicker way, however, is the Apply Image tool. Located in the Image drop-down menu, the tool is usually used to blend layers and channels from separate images. If, however, you select only one image, "apply" is a super quick way to preview the special effects that are possible by blending an image with itself.