Two or more images are combined by designating one image as a threshold image based on information within the images themselves. Pixels in this threshold image are then segregating into foreground and background pixels according to some criteria. An alpha value is set to zero for background pixels indicating that these pixels in the threshold image will make no contribution in the combined image. The foreground pixels of the threshold image are set to some value greater than zero. Alpha values in the non-threshold image(s) are set such that the total value of alphas for pixels in the images to be combined totals one (indicating 100% total contribution).

 
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