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midzki said: denoise filters are based on blur methods, thus couldn't work well on RGB range 0~1, or 254~255. because the RGB range of the result images are closed in 1~254. 16bit filtering helps the result a bit, but still not good. therefore, you may always need to clip out range 0~1 and 254~255 using levels.
You are talking about quantization noise here, you can also consider adding a very weak noise (1~2 levels) to shift this quantization noise to a higher frequency range like they do with 16bit audio. Or just leave out a little high frequency noise when filtering.
kiowa