Let Gradfun output an undithered image of higher bit depth.
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For my understanding the gradfun filter takes an 8 bit per channel image, converts it to a higher bit depth and then smoothes gradiation steps with little color delta to achieve an image of virtually higher bit depth. Then the data is converted to 8 bit again and dithered.
As, beneath viewing movies, an other very useful application of gradfun is to convert 8 bit material from cameras (which produce banding) to higher depth intermediate codecs (like DNxHD 185x which uses 10 bit) for video editing tasks, it would be helpful if the filter could also skip the dithering and output an image with higher depth directly for such purposes.