As well as there are multiple desaturation methods, GIMP alone offers at least three, and I'm sure that could influence the outcome as well. https://docs.gimp.

As well as there are multiple desaturation methods, GIMP alone offers at least three, and I'm sure that could influence the outcome as well. https://docs.gimp.org/2.8/en/gimp-tool-desaturate.html https://docs.gimp.org/2.8/en/gimp-tool-desaturate.html