Generally, adding two or more elements together to create a composite. In computer graphics, programs such as Photoshop and Painter (among many others) allow for several images to be combined with each other. In so doing, the program much calculate (or the user must set) transparency information for each separate image (or a clipping path for an image). The images can often be stored on separate "layers" within the program, so that they can be edited individually. All layers can then be merged when editing is complete, yielding a composite image.