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Not necessarily. It first begins by depending on what your settings are (ISO, aperture, shutter speed). With all settings neutral, if I add an extra stop of light, i’m going to get more blown out exposure from letting more light in (f/4 -> f/2.8 — this will open the lens wider, therefore letting more light hit the sensor) but no additional grain since my ISO may be set at my bodies base of 100-200 ISO for shooting outdoors.

Now if i’m shooting indoors and my glass doesn’t have a decent f-stop that shoots in lowlight, i can leave my aperture down and raise my ISO to maybe 1200, but when you do this, that is when you’ll get grainy pictures because you’re moving away from the cameras sensor base ISO that it’s calibrated for.

But if you want to adjust everything in post processing, you’ll need to shoot RAW because JPEG do not hold enough data that’ll allow you to adjust it accurately.

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