Highlighting faint diffuse objects

Three small applications are included in ESP for the purposes of detecting faint diffuse objects in an image. The algorithms employed are used to generate versions of the source image in which the contrast has been heightened for an object of a given scale length. They are described in the sections that follow. For all the commands given here, if the image IN has a SKY co-ordinate frame in its WCS component, the PSIZE parameter will be calculated automatically and need not be given explicitly.