Funnily, I also don't like these techniques but that's because I'd rather eliminate the noise myself and have a noiseless image when possible. Grain, to me, is simply annoying. Adding it and preserving it has little value.
In subjective tests, normal people often report grain (real or reconstructed) as a defect so you're probably in the majority of viewers. Creators and codec nerds value them more than the audience.
So these grain removal techniques are in many ways a political compromise between people who just want the smaller video, and the people who want the grain.
I'd be fascinated to see how codecs with and without this feature diverge in terms of encoding changes. Presumably there were some big gains just sitting there but the minority that preferred grain stopped then being exploited.
Much of the drama around encoder quality has came down to this dichotomy. Choosing to lose the grain/detail was attacked as plastic or fake by the people who care about it, while people who didn't could point to better test scores. Which then caused more arguments about the validity of the measures.
I am a film person (director, camera guy, work in post production). Grain is an aesthetic choice and has an effect on the perception of an image.
Sure, for the typical Hollywood blockbuster it has not much value and can break the immersion, but for everything else grain can make you look on a picture, rather than into it. This could be the difference between looking through a window and looking at a painting for example. Additionally grain can emphasize the passing of time. A shot of a still life without grain is something different from the very same shot with grain.
Today it is just another tool in the aesthetical toolbox. And someone somewhere decides when to have it and when not to have it.
Now-a-days, I agree, grain is more of an aesthetic choice and for modern films. And, in fact, I generally don't enable de-noise when it's fairly clear that's what's happening.
However, for a lot of film shot pre-2010, grain is an artifact that's not there by choice or artistically. Other than perhaps the film 300.
It just so happens that most of my personal media fits in that box of being pre-2010 which is why I generally denoise.
Something like 30 rock, or The Office, for example, don't have film grain because of some artistic choice.
Interestingly, though, "That 70s' show" does in a few cases even though it's somewhat noisy be default. That's a more tough call.
Even before 2010, directors and their cinematographers put a lot of thought into what film stock to use in order to build the aesthetic they want for their film. Grain characteristics are one of the most prominent distinctions among different stocks.
Again, depends on what's being shot. Like I said, 300 is a good pre-2010 example of a film stock/grain specifically chosen for it's artistic value.
However, for a bunch of film and especially tv shows, the choice had FAR less to do with aesthetics and was more related to cost. Big budget films certainly could pick any sort of equipment/stock they wanted. Lower budget productions didn't necessarily have that luxury.
I'm not saying it didn't happen, rather that the choice in stock was more often than not "cheap while being as clear as we can afford".
Again, you see this with modern film where grain is almost never added (except for specific scenes trying to give more of a dated effect). That, to me, says cinematographers aren't generally trying to pick their stock to add grain. Some do, but that's the exception and not the rule.
Exactly this, there have long been plugins for edit suites that let you specify the grain and color process of specific film stocks to get the look you want.
People today miss the point that things like grain can be an intentional directorial choice and not an artifact to be removed.
in that case, this is still probably a good feature for you since you can make an encoder that just doesn't re-synthesize noise and you'll get a de-noised picture.
Not really, because these encoders are (generally speaking) making pretty large compromises with their noise filters in order to be timely. I want to spend the extra time doing motion compensated denoising.
These noise filter will sometimes be temporal, rarely will be motion compensating (because that's computationally expensive) and as a result can't get as good a result as I can.
