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It’s the same with the value of company stock. It’s essentially a ponzi in a way. If a billionaire actually tired to sell all their assets quickly they wouldn’t be able to liquidate it all for the value that it’s worth on paper because the value would drop if they tried.
Instead of file grain they should use dithering if they want to remove banding.
The film grain doesn’t really hide the banding that well.
I think the film grain is just to make it look like a film not to hide color banding.