cdgriffith
Add Grain
With Hollywood using DNR more and more to “sharpen” images it’s causing films to look less organic. An added open to add grain to heavily DNR’d films would be a nice feature, such as light, medium, and heavy. While it won’t bring back the detail lost it can help mitigate the plastic/wax look.
The two main issues with this is:
- There is no simple filter for it with FFmpeg. Most of the ways to tackle it I see with a fast search are rather complex / multiple commands.
- I hate grain (almost as much as I hate when they mutilate the source material, like DNR, so I feel ya.)
Marking as "help wanted" as this is something I won't tackle myself, but if someone provides a PR with a good implementation of it I wouldn't turn it away. Thanks for the idea, as it is truly something I wouldn't think of myself 🙂
Dunno if is technically achievable, but @EleonoreMizo's "Realistic film grain generator" (ChickenDream) port - it's a Vapoursynth and Avisynth+ plugin - would be great.
I wouldn’t encourage people to use ChickenDream for this use. It’s a very CPU-intensive model (takes several seconds per frame on a high-end CPU), and for light grain, you probably would not tell the difference with a simple gaussian noise applied in linear light.
BTW FFmpeg has a noise filter. Not tested, but could be useful here.
