Abstract: A procedure and device for analyzing the gray scale of mammograms. Mammogram images are digitized and subject to image enhancement by manipulating the gray scale. Each pixel of the digitized mammogram is grouped as to a gray scale interval and those pixels lying in the same gray scale interval are assigned a common display value. The display values are displayed for each pixel location on both a color and monochrome monitor producing a unique pattern giving a finer detailed image of density changes in breast parenchyma. Interpretation of these patterns indicate suspicious areas where immediate magnification of the suspect area can produce a better image of a mass for application of known malignant tumor characteristics.