Is there some technical reason why alpha doesn’t get denoising?
Having shadow catcher is awesome, but one often has to avoid it, resorting to extracting shadows in the old way from a purpose-made scene-duplicate render layer, because otherwise sampling has to be cranked up 10x, to fix alpha that doesn’t get denoising.
While denoising against background works just fine without transparency.
If the alpha is put through the denoiser separately from the image, it does apply denoising indeed and can be “SetAlpha” with the RGB image.
Still makes me wonder why alpha isn’t done at least in this way as an option, but it does seem to work. Thanks!