What general image processing tools are included with the core system?
The IRAF core system is the basic IRAF system and does not include the suite of reduction packages known as the NOAO package. (But note that the NOAO package is included in all IRAF distributions.) The IRAF core system provides tools for reading and writing data in the transportable FITS format (although other i/o tools are available), interactive graphics and image display tools for examining your data, tools for image registration and cleaning bad pixels, a variety of smoothing operators, and tools for image arithmetic, image statistics and combining image frames.
