Glossary · Exposure (over and under)
What is overexposure and underexposure in a photo?
Short answer
Exposure is how much light a photo records. An overexposed photo took in too much, so bright areas turn pure white and lose detail. An underexposed photo took in too little, so it looks dark and shadows turn black. Mild underexposure can often be fixed by editing; blown-out highlights usually cannot.
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What do over- and underexposed photos look like?
| Overexposed | Underexposed | |
|---|---|---|
| Overall look | Washed out, pale, low contrast | Dim, muddy, heavy shadows |
| Problem area | Sky, windows, white clothing turn flat white | Hair, clothing and interiors sink into black |
| Common cause | Bright sky behind the subject, or tapping a dark area to meter | Indoor or evening light, or metering on a bright window |
| Edit can rescue? | Rarely, once areas are pure white | Often, if shadows still hold detail |
Why can dark photos be saved but bright ones can't?
A camera sensor records each pixel as a number. When a pixel reaches its maximum value, it is 'clipped': every brighter tone is stored as the same white. No editor can bring back cloud texture that was never recorded. Phone cameras try to avoid this by merging several frames, but a bright window behind a person still defeats many of them.
Dark areas behave differently. Shadows still hold faint differences between pixels, so lifting brightness reveals detail, although noise rises with it. This is why photographers say 'protect the highlights', and why a cleaner ranking near-identical frames treats a burnt-out sky as a bigger flaw than a slightly dim one.
How can I check exposure on my phone?
- Open the photo full screen and look at the brightest area. If the sky or a window is a flat white patch with no texture, it is clipped.
- Check the darkest area. If dark hair or a sofa is one solid black shape, the shadows are lost.
- Open the editor and drag brightness up and down. Detail that appears means it was recorded; nothing appearing means it was not.
- If your camera offers a histogram in pro mode, a tall spike pressed against either edge means clipping.
Before you take the shot, tapping the subject on screen and sliding the brightness control down a little is the simplest way to avoid white skies. Moving so the light falls on the subject, not behind it, solves most indoor backlight problems.
Should I delete badly exposed photos?
Delete them when a better-exposed frame of the same moment exists, or when the image is so dark that nothing is recognisable, as with most pocket shots. Keep them when they are the only record and the subject is still visible, because a quick edit may be enough.
Exposure is one of the signals used to choose a best shot from a burst. GalleryJury, the Android photo cleaner coming soon to Google Play, weighs it next to sharpness and framing when it picks the frame to keep, and asks you before it clears the others.
Frequently asked questions
Does HDR fix exposure problems?
HDR combines several frames at different brightness levels, so it reduces both white skies and black shadows. It cannot fix a frame that was badly exposed in every one of its source images, and fast motion can cause ghosting.
Why do my night photos look grainy after brightening?
Brightening amplifies the random noise the sensor records in low light. Night mode reduces this by stacking several frames, which is why it asks you to hold still.
Sources
- Files by Google Help: Delete blurry or bad pictures (checked 31 October 2026)
- Google Photos Help: Manage your storage (checked 31 October 2026)
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GalleryJury is coming soon to Android
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