1. A method for classification of an input image in picture or graphic classes, comprising the following steps: a) extracting one or more one-dimensional color discreteness features from the input image; b) conditioning each extracted feature to prepare the feature for subsequent processing; c) processing each conditioned feature using an algorithm associated with the feature; d) comparing the result of each feature algorithm to one or more previously selected thresholds, and e) if, according to previously determined rules, any comparison is determinative of the class of the input image, classifying the input image in either the picture or graphic classes according to the previously determined rules, otherwise indicating the result is indeterminate.