Other notes:
- AI denoisers "hallucinate" in details where there are none, so sometimes they get it wrong. This is especially true with things like say leaves on a tree, grass blades in a field, and so on (the more dense and "random" that part of the image, the more likely an AI denoiser is to change it in some way)
- The Intel denoiser may have problems with black or near-black images, where it actually brings the lighting level up. This may be most noticeable in LightMix for instance, and can add a kind of a "glow" to things where it shouldn't be (Intel is aware and working on this, afaik)
- Neither AI denoiser can work with the new High Quality Image Filtering; this is because they have been trained on the other type of filtering on what noise to "expect" in a rendered image. Intel will be/are working with us on retraining it to work with that kind of filtering.
- Due to the "hallucination" process, the results may change from frame to frame, which could be a problem in animations.