  We present the SWAP Filter: an azimuthally varying, radial normalizing filter
specifically developed for EUV images of the solar corona, named for the Sun
Watcher with Active Pixels and Image Processing (SWAP) instrument on the
Project for On-Board Autonomy 2 spacecraft. We discuss the origins of our
technique, its implementation and key user-configurable parameters, and
highlight its effects on data via a series of examples. We discuss the filter's
strengths in a data environment in which wide field-of-view observations that
specifically target the low signal-to-noise middle corona are newly available
and expected to grow in the coming years.
