@Iain and i have been working heavy on a darktable implementation of his ideas, many things had to be implemented in a slightly different way or required new stuff in dt. It’s already usable with good performance (on my 8core E-2288G the algo takes <100msec on the selected image), some issues remaining but we both are confident we find a good solution.
Here is a screenshot, no filmic applied so no interference from there, slightly dark for better view of the highlights, just default color management.
