Document de-fish #37
Description
The de-fish feature was added with pull request RawTherapee/RawTherapee#6689. At the time of this writing, de-fish works on equidistant fisheye projections. It is located in the Distortion Correction section of the Lens / Geometry tool. There is an adjustable focal length parameter. A scale slider has been added to Lens / Geometry for manual scale adjustment when Auto-fill is disabled.