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I don't know what to call this but this kind of grain/static (almost like an old TV) showed up when I created a low quality gif of an animation- see the sky and little particle bits emitting: https://dribbble.com/shots/5297810-Dystopian-game-preview-low-res

How would you create this in AfterEffects over a static image?

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    aescripts.com/retrodither ? – joojaa Oct 16 '18 at 20:39
  • It's merely a heavily dithered gif. – Scott Oct 16 '18 at 21:24
  • @Scott so the effect is called dithering? I want to apply it on purpose – UserDude Oct 16 '18 at 23:08
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Open an image, and click Image > Mode > Indexed Color

Set the dither to Diffusion, amount 100%

enter image description here

Afterwards, you can convert back to RGB colour mode. The effect will still remain.

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