A description of two methods for enhancing perception of detail in black-and-white images. Image enhancement by pseudocolor involves the problem of specification of chromaticities and luminances. Two techniques of producing color by three-primary mixtures are discussed: a computer-based approach (with considerable versatility), and a relatively simple process of photographic transformation. The first technique is limited only by the sophistication of the image-processing program and the data handling capacity of the computer. It is a costly approach requiring appropriate scanning of the original black-and-white image for input. Attractions of the photographic technique include the low cost factor, flexibility in type of color renditions possible, and the availability of processing equipment to medical personnel for clinical tasks. Pseudocolor techniques are being used to design psychophysical experiments in pattern recognition and may be applied to chromosome photomicrographs, X-ray films, and pathological specimens. 33 pp. Ref.