Often, it will be found that an image of a galaxy will contain, within its isophotes, brighter areas due to satellite galaxies or other foreground and background objects. Since these do not arise at predictable sites (due to faults in the CCD or optics), it is not possible to remove these objects without a visual inspection. The simplest way to remove these is to display the image using KAPPA's DISPLAY and to then set the offending areas of the frame to the bad value by interactive use of the KAPPA's ARDGEN and ARDMASK applications. Unfortunately, it is usually necessary to carry out this process with all the images that are to be profiled.
ESP --- Extended Surface Photometry