@j.p.s: Okay, so, yeah, we're agreed that my use of effective was confusing then

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Oh, the fact that the video content itself might already show banding artifacts is also quite likely, true. But technically another issue, because the source is already flawed in these cases

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Again, another vast subject I'll refrain from launching on, because it truly would be completely OT then, and we're already skating the line ^^.