ABSTRACT
This chapter looks at complex techniques such as deconvolution, other star-shrinking techniques, removing stars, restoring star color and looks at the essential supporting act of creating and using star masks. The deconvolution process starts in earnest with the supporting process of describing a Point Spread Function (PSF). This is a model of the effect of all those imperfections on a perfect point light source. The Dynamic PSF process starts with a cropped linear image and before noise reduction too. The Local deringing option addresses the ringing around the brighter stars. It does this by limiting the growth of artefacts at iteration of the deconvolution algorithm. Mask-building skills are worth acquiring though; they come in handy during many processes as well as deconvolution. Although the tool can be used on unmolested linear and non-linear images, in practice, it is easier to use on a stretched image.
