How to Fix Grainy Old Photos
Grain in an old photo comes from fast film, underexposure, or a low-resolution scan. Reduce it with light noise reduction that targets flat areas like skin and sky while protecting edges and eyes. Heavy smoothing removes grain but also detail, leaving faces looking waxy.
Where the grain comes from
Three common sources: fast film shot in low light, an underexposed frame that was brightened in printing, and a low-resolution or dirty scan. A grainy scan of an already grainy print stacks the problem.
Scan before you fight it
If the print itself is only mildly grainy, a poor scan can be most of what you see. Scan at 600 dpi, clean the glass and the print surface, and you may find the grain problem is smaller than it looked.
Reduce gently, protect detail
Noise reduction works by smoothing areas it thinks are flat. That is fine for skin, sky, and walls, and bad for eyelashes, hair, and fabric weave. Use a tool that lets you dial the effect down on faces, or apply it selectively. Start weak and increase only as needed.
The waxy look, and how to avoid it
Faces go plastic when smoothing is strong and uniform. Two fixes: ease the effect off facial detail, and add back a faint, even layer of grain so a de-noised patch does not sit oddly against the textured areas around it.
Check at the real size
Grain is a screen problem as much as a photo problem. What screams at 100 percent zoom often disappears in a modest print. Judge the result at the size you will actually use.
Doing it on iPhone with Aion
Aion’s Improve Quality treatment reduces noise as part of rebuilding detail, and it is tuned to hold on to facial features rather than smoothing them flat. Combine it with face restore for portraits.
