A method for image processing of a plurality of digital images comprising the steps of determining one or more sets of pixel characteristics, each set having at least one characteristic that is location independent; determining for each pixel characteristic set, an image processing filter; providing a mixing function algorithm embodied on a computer-readable medium for modifying the plurality of digital images; and processing each of the digital images by applying the mixing function algorithm based on the one or more pixel characteristic sets and determined image processing filters. Various mixing function algorithms are described. An application program interface embodied on a computer-readable medium is also provided.