1. A computer implemented method of finding image intensities in an image, comprising: displaying an image on a display device having a range of intensities; identifying one or more regions of the image according to the intensity values in each of the one or more regions; categorizing each region as falling into one intensity zone category from a set of intensity zone categories according to the intensity value for each region; and displaying the image on the display device with the regions and corresponding related intensity zone categories highlighted.