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To my eyes, a lot of film sets look too pristine when shot as-is, the grains help to make the sets look a little dirty and worn for that added realism.

Alternatively you can paint/airbrush every set piece to add that used/worn look, but I don’t think it’s economically feasible.

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That reminds me of an anecdote: one of my teachers in high school was on the German version of Family Feud. That was back in the days of analog TV.

He told us how shabby the set looked like in reality. But none of that was visible on PAL tv.

I guess that's the opposite of the effect you were talking about.

Pretty sure you’re talking about CRT TV’s scanline effect.

It leaves gaps in the image for you brain to “fill in the gap” and add perceived detail.

I don't think so? I'm just talking about low resolution (and low quality) in general.

Interleaved scanlines are a great trick to increase the temporal resolution, but don't do much for (or against) spatial resolution.

Or what do you mean by scanline effect?

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