1. An external depth map transformation method for conversion of two-dimensional images to stereoscopic images comprising: obtaining an external depth map associated with a two-dimensional image; obtaining at least one mask associated with at least one area within the two-dimensional image; calculating a best fit for a plane using a computer based on depth associated with the at least one area associated with each of the at least one mask; and, applying depth associated with the plane having the best fit to the at least one area to shift pixels in the two-dimensional image horizontally to produce a stereoscopic image or stereoscopic image pair.