1. A method for classification of an input image in picture or graphic classes using a combination classifier, comprising: a) performing a picture/graphics classifier on an input image using one or more one-dimensional color discreteness features; b) if the result of the picture/graphics classifier using one-dimensional color discreteness features is indeterminate, performing a picture/graphics classifier on the input image using one or more two-dimensional color discreteness features; and, c) if the result of the picture/graphics classifier using two-dimensional color discreteness features is indeterminate, performing a picture/graphics classifier on the input image using a three-dimensional color discreteness feature.