1. An image processing apparatus, which performs a black generation process and an under color removal process with respect to image data including a plurality of color components, comprising: a segmentation section for judging whether each pixel or each block including a plurality of pixels in the image data belongs to a black text area or not; and an under color removal section for performing the under color removal process with respect to the image data, the under color removal section performing the under color removal process so that an under color removal value for each pixel of at least a part of pixels judged by the segmentation section to belong to a black text area is larger than a minimum color component density level and smaller than a maximum color component density level of the pixel.