1. A method for feathering a first image and a second image in a composite frame, comprising the steps of: receiving an original matte image; a first box filtering step including box filtering at least a portion of the original matte image horizontally and vertically to generate an intermediate matte image; a second box filtering step including box filtering at least a portion of the intermediate matte image horizontally and vertically to generate a processed matte image; and generating a composite image by blending the first image and the second image together according to the processed matte image; wherein the step of box filtering the original matte image includes a step of processing the original matte image through a first box filter having an even filter width that is biased in a first direction: and wherein the step of box filtering the intermediate matte image includes a step of processing the intermediate matte image through a second box filter having an even filter width that is biased in a second direction that is opposite the first direction.