Abstract: A digital image processing method includes the steps of embedding a delta function in a digital image; subjecting the digital image to an intermediate processing step, the intermediate processing step having a modulation transfer function (MTF) that blurs the image; extracting the delta function from the processed digital image; and estimating the MTF from the recovered delta function. The blur is removed from the image by generating a sharpening filter that is substantially the inverse of the MTF and applying the sharpening filter to the blurred image to produce an improved image.

Abstract: An imaging element is described which comprises a colorless coupler compound which contains an oxidizable lueco dye moiety and optionally a colorless dye image-forming coupler compound. Following color development a masking dye is obtained by oxidation of the leuco dye moiety in areas where no photographic development occurs.