How to remove noise and grain from photos

Updated 13 October 2026 · UnBlur AI guides · 9 sources

AI results are estimates. AI restoration predicts what a sharper or repaired photo might look like. It can invent or change details, especially faces, text and fine patterns. Always keep your original, and do not use an AI-restored image as evidence or to identify someone.

Key points

Noise is random variation in brightness or color; in phone photos it mostly comes from the sensor in low light. ¹
Film grain is the texture of the film itself, made by silver particles or dye clouds; it is part of the original image. ²
Higher ISO lets a camera shoot in dim light but adds noise. More light, Night mode and a steady phone prevent most of it. ^3,4
The Noise Reduction slider in Photos smooths speckles, but strong settings also smooth away real detail. ^5,6

To remove noise from a photo on iPhone, open it in Photos, tap the Edit button, choose Adjust and move the Noise Reduction slider a little at a time. That handles most speckly low-light shots. Before you do, though, it helps to know whether you are looking at digital noise, which you usually want gone, or film grain, which is part of an old photo's character.

Digital noise from a phone sensor looks like random colored speckles, mostly in dark areas; film grain is the texture of the film itself and spreads more evenly, usually without color.

Noise and grain are not the same thing

Digital noise is random variation of brightness or color in an image. In digital cameras it comes mostly from the image sensor and its electronics ¹. It looks like fine colored speckles or a gritty texture, and it is strongest in shadows and dark skies, because the sensor received little light there.

Film grain is the visible texture of processed film. It forms from tiny particles of metallic silver, or clouds of dye in color film, and becomes more obvious when a small negative is enlarged a lot ². In film days, faster film (higher ISO) produced larger, more visible grain ³. Grain belongs to the original photograph; removing it changes the picture.

Why phone photos get noisy

When light is low, the camera raises its sensitivity (ISO) so it can still use a short exposure. Higher ISO lets you shoot in dim places without blur, but it also amplifies noise ³. Phones also brighten dark scenes with processing, which can make noise or smudgy "painted" textures more visible. Typical culprits:

Indoor shots at night, concerts and restaurants
Brightening a dark photo a lot after the fact
Digital zoom, which enlarges the noise along with everything else
Cropping a small part of a photo and enlarging it

How to avoid noise in the first place

Add light. Turn on a lamp, move toward a window or step closer to the light source.
Let Night mode work. On supported iPhones, Night mode turns on automatically in low light. Hold the phone still while it captures; Apple suggests a tripod for even more detail ⁴.
Use the optical lenses. Stay at a lens's native zoom steps instead of pinching far past them.
Do not over-brighten later. A slightly dark but clean photo often looks better than a bright, noisy one.

More tips are in iPhone camera settings for sharp photos.

Reduce noise in the Photos app

Open the photo in the Photos app, tap the Edit button, then tap Adjust ⁶.
Swipe through the adjustments to Noise Reduction. Apple describes noise as the graininess or speckles that appear in low-light photos, and the Noise Reduction slider reduces or removes it ⁵.
Raise it gradually and zoom into a face or a textured area. Stop when the speckles calm down but hair, fabric and edges still look natural.
If the image now looks soft, add a small amount of Sharpness or Definition, then recheck the shadows.
Tap Done. Edits in Photos are not permanent; you can revert to the original later ⁷.

Free desktop editors also include noise reduction or "despeckle" filters that work the same way: they average neighboring pixels, which removes random speckles and, at higher strengths, fine detail too.

When to keep the grain

Scans of film prints and negatives. Grain is part of the original. Heavy smoothing gives skin a plastic, waxy look and can erase fine detail such as hair and fabric. Archival digitization guidelines do not allow dust removal or tone and color restoration on master scans ⁸, so keep an untouched master too; see how to scan old photos.
Black-and-white photos. A fine, even grain often looks better than a smooth, artificial surface.
Dust is different. White specks and hairs on a scan are dust on the print or scanner glass, not grain. Clean the glass and the print surface gently and rescan rather than smoothing the whole image.

A useful rule: reduce noise until it stops distracting, not until it disappears.

Using an AI tool on noisy photos

AI restoration models redraw the whole image, so their results often look cleaner than a noisy original. The model has to decide what is noise and what is detail, though, and it may smooth real texture or replace it with invented texture ⁹. UnBlur has no noise slider; its Unblur and Restore Old Photo modes regenerate the photo as a whole, and you then compare ORIGINAL and ENHANCED on the result screen. Check faces, text and fine patterns closely, keep your original, and read what AI restoration can and can't do before relying on a result.

Common questions

Why does my night photo look like a watercolor painting?

Strong noise reduction, in the camera or in editing, smooths away fine detail along with the speckles. Less noise reduction, more light or a steadier shot usually looks more natural. ^1,4

Should I remove grain from old family photos?

Usually only lightly, if at all. Grain is part of the original film image, and removing it can make faces look artificial. Keep an untouched scan as your master. ²

Does noise reduction make photos less sharp?

It can. Noise reduction averages nearby pixels, so strong settings also soften edges and texture. Raise it gradually and check a detailed area at full size. ⁵

Sources and further reading

Wikipedia. Image noise. en.wikipedia.org
Wikipedia. Film grain. en.wikipedia.org
Nikon USA, Learn and Explore. Understanding ISO Sensitivity. nikonusa.com
Apple Support. Take Night mode photos with your iPhone camera. support.apple.com
Apple Support. Reduce noise in a photo or video on Mac (Photos User Guide). support.apple.com
Apple Support. Edit photos and videos on iPhone. support.apple.com
Apple Support. Undo and revert photo edits on iPhone. support.apple.com
Federal Agencies Digital Guidelines Initiative. Technical Guidelines for Digitizing Cultural Heritage Materials, 3rd edition (2023), section 3.8 Prints and Photographs (PDF). digitizationguidelines.gov
Blau Y, Michaeli T. The perception-distortion tradeoff. IEEE CVPR. 2018. arxiv.org