1. A method for visually compositing a group of objects in an image, comprising: determining a modified opacity for a first object in a first group of objects based on a first group opacity for the first group of objects and an initial opacity for the first object in the first group of objects; and determining a modified opacity for a second object in the first group of objects based on the modified opacity for the first object in the first group of objects and an initial opacity for the second object in the first group of objects, wherein the modified opacity for the first object in the first group of objects and the modified opacity for the second object in the first group of objects are used to composite the first group of objects.