... We have developed a set of tasks in the IRAF environment for registering, matching the point-spread functions, and matching the intensity scales of two or more images. ... The current software performs spatial registration by supplying the registration task with a reference and input image list, and a list of features common to both images. ... The current software requires the input and reference images to be spatially-registered and PSF-matched. ... CTIO 4-m images courtesy of Nelson Calwell.) ...