1. An image processing apparatus, comprising: a fluorescence pixel detecting unit configured to detect a fluorescence pixel that has a fluorescent color in a document image; a peripheral pixel analyzing unit configured to detect consecutive non-fluorescence pixels with no fluorescent colors among peripheral pixels within a predetermined range from the detected fluorescence pixel, the consecutive non-fluorescence pixels being at least a predetermined number of consecutive pixels and having a color difference equal to or less than a predetermined value between one and another of the consecutive non-fluorescence pixels and; an image processing unit configured to perform an emphasizing process of improving visibility for the detected consecutive non-fluorescence pixels.