PhotoDemon provides a comprehensive polar coordinate conversion tool. Forward and reverse transforms are included, as well as a “polar inversion” technique similar to that of Paint.NET. X and Y coordinates can be swapped – often helpful if additional actions will be applied to the transformed image – and a radius can be set if only part of the image should be converted.
Like other distortion tools in the program, five options are provided for dealing with off-canvas pixels (clamp, erase, ignore, reflect, wrap). A dedicated Quality option uses bilinear interpolation to further improve the quality of the final image.
Finally, like all PhotoDemon tools, a dedicated command bar allows you to save and load custom presets, randomize parameters, and reset to default values. Last-used settings are automatically saved and restored, and all changes provide a real-time preview (no click or mouse button release required).