1. A decompression process for a compressed interpolated image wherein the compressed interpolated image was interpolated using a prescribed interpolation method prior to compressing using a known lossy compression scheme, the process comprising the steps of: a) finding a first image, the first image being an image that has been interpolated in the prescribed way; b) finding a second image, the second image being the interpolated compressed first image that has been compressed to the compressed interpolated image output by the compression scheme; and c) if the first image is sufficiently different from the second image, repeating steps a) and b).