How to Troubleshoot Galaxy S23 Grainy Photos in Low Light

Grainy, noisy, or muddy photos in low light are one of the most common complaints from Galaxy S23 owners — and as of 2026, it’s a problem that can be made worse or better depending on your One UI version. The good news: most grainy low-light shots aren’t a hardware defect. They’re the result of the camera defaulting to high ISO sensitivity when it can’t get enough light, and a few targeted settings changes are usually all it takes to get clean, sharp results.

This guide walks through every practical fix — from Night Mode basics to Pro Mode manual settings to the Expert RAW app — ranked from the most common cause to the most advanced solutions. If you’ve recently updated to One UI 7 and noticed a sudden drop in camera quality, there’s a specific fix for that too.

What Causes Grainy Low-Light Photos on the Galaxy S23?

Before jumping to fixes, it helps to understand why graininess happens. When your Galaxy S23 shoots in a dark environment, it has two main tools to compensate for the lack of light: raise the ISO (sensor sensitivity) or slow down the shutter speed. Both have trade-offs.

High ISO — The S23’s ISO range is 50–3200 in standard mode (higher in Pro). Every jump in ISO adds digital noise. ISO 3200 in a dimly lit room will look noticeably grainy compared to ISO 400 in the same scene.
Slow shutter speed without stabilization — A slower shutter lets in more light, but any camera movement during the exposure shows up as blur or smearing that looks like grain when scaled.
Aggressive AI processing — Samsung’s Scene Optimizer and HDR processing can over-sharpen or over-process low-light images, producing an artificial “crunchy” texture.
Digital zoom — Using 2x or higher zoom in low light dramatically amplifies noise because the camera is cropping into a smaller portion of the sensor.
Dirty lens — A smudge or film of oil on the lens scatters light and degrades sharpness, which can look like grain in the final image.
One UI camera bugs — Both the One UI 6.1.1 and One UI 7 updates introduced camera degradation for S23 users, with reported increases in graininess and over-processing. More on this below.

Fix 1: Use Night Mode (Most Common Fix)

Night Mode is the single most effective built-in tool for low-light photography on the S23. Instead of capturing one frame at a high ISO, Night Mode uses multi-frame processing — the camera takes 30+ rapid frames, stacks them algorithmically, and produces a single image with dramatically less noise and better color accuracy than a standard shot.

To enable Night Mode on your Galaxy S23:

Open the Camera app.
Swipe the shooting modes to select More.
Tap Night.
Hold the phone as still as possible (or brace against a surface) and tap the shutter. The moon icon in the top-left confirms Night Mode is active.

Pro tip: Night Mode works best with a steady hand or a surface to rest the phone on. The longer the exposure, the more blur from movement. If the scene has moving subjects (people, cars), Night Mode may still produce motion blur — in those cases, switch to Pro Mode with a faster shutter speed instead.

Fix 2: Manually Lower the ISO in Pro Mode

When the Galaxy S23 camera is in Auto mode, it will aggressively push ISO upward in dark environments — sometimes to ISO 1600 or even ISO 3200 — which produces heavy grain. Switching to Pro Mode and setting the ISO manually is the most direct way to control this.

To access Pro Mode and set ISO:

Open the Camera app and swipe to More → Pro.
Tap the ISO dial at the bottom of the screen.
Set ISO to 400–800 for indoor/ambient lighting. Use ISO 100–200 only if there’s a reasonable light source. Avoid exceeding ISO 1600 unless you’re specifically trying to freeze motion in extremely dark conditions.

The trade-off: lower ISO means the sensor captures less light per frame, so you’ll need to compensate with a slower shutter speed (see Fix 3) or accept a slightly darker image that you can brighten in editing.

Fix 3: Adjust Shutter Speed for the Scene

In Pro Mode, shutter speed and ISO work as a pair — you’re always trading one off against the other. Here are the recommended shutter speed ranges for different low-light situations on the S23:

Scenario	Recommended Shutter Speed	Notes
Handheld indoors (dimly lit room)	1/30s – 1/10s	Use OIS; hold phone with both hands
Outdoor at dusk / street lighting	1/60s – 1/30s	Bracing phone against a wall helps
Long exposure (tripod required)	2s – 30s	Use a timer shutter to avoid tap-blur
Moving subjects in low light	1/125s or faster	Raise ISO to compensate for speed

For handheld low-light shooting without a tripod, keep shutter speed at 1/30s or faster to prevent motion blur from hand movement. Anything slower than 1/15s should be supported on a stable surface.

Fix 4: Toggle Scene Optimizer On or Off

Scene Optimizer uses AI to detect the type of scene you’re photographing and automatically adjust color, exposure, and sharpness. For most situations it works well, but several Galaxy S23 users in Samsung’s community forums report that Scene Optimizer over-processes low-light shots — producing an artificial “painterly” or gritty texture.

To toggle Scene Optimizer:

Open Camera Settings (tap the gear icon).
Tap Shooting methods (or scroll down to find Scene Optimizer directly).
Toggle Scene Optimizer off.

Try a few shots with it off and compare. Some users prefer it enabled for daytime shots and disabled specifically for nighttime photography. If you shoot primarily in Pro Mode, Scene Optimizer is automatically bypassed.

Fix 5: Disable Auto HDR

Auto HDR on the Galaxy S23 takes multiple exposures and merges them, which can add artifacting or haloing in low-light conditions. If your low-light photos look over-processed or have an unusual texture around edges, try turning HDR off.

Go to Camera → Settings (gear icon).
Tap Advanced picture options.
Set HDR (rich tone) to Off.

Fix 6: Use Expert RAW for Maximum Control

For serious low-light photography, Samsung’s Expert RAW app (free download from the Galaxy Store) gives you controls that go beyond the standard Pro Mode, including astrophotography, multi-exposure stacking, and long-exposure modes designed specifically to minimize noise.

In Expert RAW, every shot can be saved as a 16-bit Linear DNG RAW file alongside the JPEG. RAW files retain all sensor data without in-camera compression, giving you dramatically more latitude to reduce grain in post-processing apps like Lightroom or Snapseed.

Recommended Expert RAW settings for low-light interiors (as of 2026):

ISO: 400–800
Shutter speed: 1/15s to 1s (use a surface or tripod for anything under 1/30s)
White balance: Tungsten (3200K) for warm artificial lighting; Daylight (5500K) for outdoor moonlight scenes
Format: RAW+JPEG
Focus: Manual focus with focus peaking enabled

For astrophotography specifically, Expert RAW’s dedicated Astrophoto mode stacks multiple 30-second exposures over 4–10 minutes. The phone must be on a tripod; the app will alert you if stabilization is insufficient. Both JPEG and RAW stacked files are saved automatically.

Fix 7: Clean the Camera Lens

A smudge or oil film on the Galaxy S23’s glass lens cover doesn’t just reduce sharpness — it scatters light into the sensor in a way that mimics the look of grain, especially in low light when the camera is working harder to expose correctly.

Use a clean microfiber cloth (the kind used for glasses or screens) and wipe the lens in small circular motions. Avoid paper towels, shirt fabric, or tissue — all of these can leave micro-scratches on the lens cover over time. If you use a case, check whether the case edges are obscuring part of the lens aperture — even partial blockage will cause visible degradation in low light.

Fix 8: Stabilize the Phone or Use a Tripod

The Galaxy S23 has optical image stabilization (OIS), but OIS can only compensate for so much. In very dark conditions with slow shutter speeds, even minor hand movement creates motion blur that gets processed into noise by the camera’s algorithm.

Practical stabilization options ranked by cost:

Free: Brace the phone against a wall, doorframe, or table. Rest your elbows on a flat surface when shooting handheld.
Budget: A mini tabletop tripod with a phone mount (~$10–$15 on Amazon) is effective for static low-light scenes.
Best: A full-size tripod with a ball-head mount (~$25–$50) for long exposure or astrophotography. [INTERNAL LINK: best phone tripods]

When using any tripod, set the shutter using a 2-second timer delay (Camera Settings → Shooting methods → Timer → 2 sec) so your tap doesn’t shake the phone when the exposure starts.

Fix 9: Avoid Digital Zoom in Low Light

Using 2x or 3x zoom in dark conditions is one of the fastest ways to produce a noisy image on the Galaxy S23. The S23’s primary camera sensor is 50MP — when you zoom in, the camera crops into a smaller portion of that sensor or switches to a lower-quality secondary sensor, which has less light-gathering ability per pixel. In low light, this means much higher ISO and much more noise.

For low-light photography, always shoot at 1x (wide angle). If you need a closer frame, move physically closer to the subject rather than using digital zoom. Alternatively, shoot at 1x and crop the photo afterward in editing — you’ll get a cleaner result than using zoom at the time of capture.

Fix 10: Check for One UI Camera Software Issues

If your Galaxy S23 photos suddenly became grainier after a software update, you’re not imagining it. Both the One UI 6.1.1 update (released late 2024) and the One UI 7 update (2025) caused documented camera quality degradation for S23 users — including increased grain, over-sharpening, and worse night mode performance.

Samsung acknowledged the One UI 6.1.1 camera issue officially, specifically noting that the Intelligent Optimization setting at Maximum was producing blurry or grainy photos in certain zoom ranges. The recommended fix at the time was:

Open Camera → Settings → Advanced picture options.
Tap Intelligent optimization.
Change from Maximum to Medium or Minimum.

For One UI 7-related camera degradation, the most commonly reported workarounds from Samsung Community forums include:

Clear the Camera app cache: Settings → Apps → Camera → Storage → Clear Cache
Reset camera settings: Camera → Settings → Reset settings
Disable Scene Optimizer (as described in Fix 4)
Use Pro Mode or Expert RAW instead of Auto mode, which bypasses much of the AI processing pipeline that was degraded by the update

Quick-Reference Settings for Clean Low-Light Photos

Use this table as a starting point for different low-light scenarios on the Galaxy S23 in 2026:

Situation	Mode	ISO	Shutter	Other
Dimly lit restaurant	Night Mode	Auto (Night Mode manages)	Auto	Brace phone on table
Concert / event (moving subjects)	Pro Mode	800–1600	1/125s+	Disable Scene Optimizer
Nighttime street / cityscape	Pro Mode or Expert RAW	400–800	1/10s–1s	Use wall or tripod
Stars / Milky Way	Expert RAW Astrophoto	3200	30s (auto stacked)	Tripod required, 4–10 min
Indoor holiday lighting	Pro Mode	400	1/30s	White balance: Tungsten 3200K

When Grain Is a Hardware Issue

In a small number of cases, persistent grain or noise across all lighting conditions — even outdoors in daylight — can indicate sensor damage, a cracked lens cover, or moisture ingress. If you’ve tried all of the above fixes and the problem persists, check whether:

The grain appears in the exact same location in every photo (dead pixels or sensor damage)
The camera produces grain even in bright daylight at ISO 50
There’s visible fogging or discoloration visible on the lens glass

If any of these apply, contact Samsung Support for a warranty or repair assessment:

Samsung Support (US): 1-800-726-7864
Online chat and mail-in repair: samsung.com/us/support
In-person: Find a Samsung Experience Store or authorized service center via the Samsung website

The Galaxy S23 launched in early 2023, which puts it within a one-year manufacturer’s warranty (expired for most users by 2024). If your device is out of warranty, Samsung’s mail-in flat-rate repair for camera issues typically runs $150–$200 depending on the specific damage. Extended warranty coverage through Samsung Care+ would apply if you purchased it at time of sale.