This is the way I do in in PS.

1. Add a new layer and fill it with 50% gray (RGB 128,128,128) & Set
the layer blend mode to overlay
2. Use Filter/Noise/Add Noise Tick Gaussian + Monochromatic.
3. Adjust noise amount to taste I usually end up with anything between
0.5% to 15%.  This naturally depends on the image.
4. Adjust the layer opacity to fine tune the effect.

I Sometimes I apply a bit of unsharp mask to the noise layer but it
does not always give a pleasing result.

Hope this helps

Regards

Patrick

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