To troubleshoot hot and dead pixels, take test shots that reveal them, check whether they change with exposure time and temperature, run your camera’s built in pixel mapping if it has one and use software spot removal for remaining specks. Persistent defects are a matter for the maker’s service team.

How to Troubleshoot Hot and Dead Pixels on Your Camera Sensor

What Hot and Dead Pixels Are

A dead pixel stays dark or black no matter what the scene shows. A hot pixel appears as a bright dot, often white or colored, and tends to show up more with long exposures, high ISO or a warm sensor. Stuck pixels stay one color. All of them are small spots on the sensor that do not respond like their neighbors, and they are different from dust, which sits on the filter in front of the sensor.

Find Them With Test Shots

  1. Put the lens cap or a body cap on so no light reaches the sensor.
  2. Take an exposure of several seconds to a minute, at a moderate ISO, with long exposure noise reduction off.
  3. View the image at 100 percent zoom and scan the whole frame for bright dots.
  4. Repeat with a short exposure at a low ISO. Hot pixels often fade, while dead pixels remain.
  5. Photograph an evenly lit white or gray surface, slightly out of focus, to see dark spots.
  6. Compare shots to see whether the dots stay in the same position. Fixed positions suggest a sensor defect, while moving spots suggest dust or noise.

Try the Built In Options

  • Look in the menu for pixel mapping, sensor cleaning with pixel refresh or similar options. Names vary by maker.
  • Use a fully charged battery before running any such routine.
  • Turn on long exposure noise reduction, which takes a second dark frame and subtracts it from long shots.
  • Check the maker’s manual for the recommended procedure for your model.

Fix the Images in Software

If a few pixels remain, remove them in post. Spot removal or healing tools in photo editors can erase isolated dots. Some raw converters offer hot pixel suppression. For a large batch, create a dark frame or a preset that targets the same coordinates.

When to Contact the Maker

If the number of defects is large, grows over time or appears in short exposures at low ISO, contact the maker’s support or your seller. Check the warranty terms for your product, and keep your test images as evidence. Avoid trying to open the camera yourself.

FAQ

Are a few hot pixels normal?

A small number is common in long exposures, especially in warm conditions. Makers differ in what they treat as acceptable, so consult their guidance.

Do hot pixels get worse?

Some people report a slow increase over the life of a camera, but experiences vary. Pixel mapping can often hide them.

The Short Version

Use dark and bright test shots to confirm which spots are sensor defects, run the built in pixel mapping, retouch the rest in software and contact the maker if the problem is large or growing.