I need a fu-script for desaturating images in gimp which enables the overlap function. Gimp exposes a procedure for desaturation which allows you to choose a channel (rgbcmy) but unlike the user interface, it does not allow to enter overlap (tolerance). Strong desaturation then results in pixelation, which is not the case with overlap. I need to get the overlap functionality exposed for scripting. I do not care how you do it (gimp is open source---you can pull it from there, or reverse engineer, or byild desaturation from scratch), but I need it done.
I can provide sample images for testing. This job is all or nothing---you either succeed and provide the feature, or this project failed. There are no milestones or partial success. Bonus for fast and reliable work available.