Image processing apparatus, image processing method, program and image forming apparatus, for performing density adjustment on an image based on a highlight part and a shadow part of a histogram of the image

摘要

The present invention relates to a technique implementing a density adjustment fitted to an image, concretely, an image processing apparatus for (1) judging the kind of a read image with a high accuracy, and (2) producing an arbitrary γ curve. The apparatus includes: a histogram calculation section for calculating a histogram of an image; a highlight part detection section for detecting a highlight part from the histogram; a shadow part detection section for detecting a shadow part from the histogram; a γ curve production section for producing a γ curve by using γ values corresponding to each of the highlight part and the shadow part, both obtained on detection results of the highlight part detection section and the shadow part detection section, respectively; and a density adjustment section for performing a density adjustment of an image on the γ curve produced by the γ curve production section.