Hi, I often find myself wanting to mask two overlay two color images, where the second image will replace values on the first image rather than adding. IE: img1 + img 2 --> adds values img1 U img2 --> replaces values Essentially, overlay all the pixels that are not black. Is there a library or set of functions somewhere that makes this easy? I remember a while back thinking I would have to write my own overlay/masking utilities to get this behavior, but I hope that's not true. Thanks