It's far better to physically add or remove light, or adjust the physical exposure settings. Operate the camera sensor in the middle of its range.
If you're towards one end or the other - too bright or too dark - you don't have as much resolution, and so the corrected image will be grainier than if you captured it right in the first place.
If you really can't do anything about that and have to live with the graininess, then you can Right-click the source -> Filters -> Effect Filters -> + button -> Color Correction. Remember to disable it periodically (click the eye), and make sure that you're not making things worse! 'Cause that's easy to do too.
