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Dead Pixel on Camera Sensor: How to Detect and Fix

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Notice a tiny bright or dark spot appearing in the same position on every photo? You might have a dead pixel on your camera sensor. Here's how to identify and address the issue.

What is a Camera Sensor Dead Pixel?

Unlike screen dead pixels, camera sensor dead pixels affect your photos rather than your display. They're defective photosites on the image sensor that either:

  • Dead pixel: Always registers black (no signal)
  • Hot pixel: Always registers bright white or colored (signal always on)
  • Stuck pixel: Always registers the same color value

How to Detect Dead Pixels on Your Camera

The Dark Frame Test

  1. Put your lens cap on (complete darkness)
  2. Set a long exposure (2-5 seconds) at high ISO (1600+)
  3. Take a photo
  4. View the image at 100% zoom on your computer
  5. Look for any bright spots — these are hot/stuck pixels

The Bright/White Test

  1. Photograph a white wall or cloudy sky (overcast is ideal)
  2. Use low ISO and aperture f/8 or higher
  3. View the image at 100% zoom
  4. Look for dark spots — these are dead pixels

Canon Dead Pixel Solutions

Canon cameras have a built-in "Pixel Mapping" function (sometimes called "Dust Delete Data" or "Sensor Cleaning with mapping"):

  1. Go to Menu → Setup/Wrench icon
  2. Find "Sensor Cleaning" or "Clean Manually"
  3. Some models have "Pixel Mapping" — run this feature
  4. The camera will remap around the dead pixel

Nikon, Sony & Other Brands

Most professional cameras have similar remapping features:

  • Nikon: Usually requires dealer service for official pixel remapping
  • Sony: Some models have "Pixel Mapping" in the setup menu
  • Fujifilm: "Pixel Mapping" found in setup menu

Software Solutions

If your camera lacks built-in remapping:

  • Lightroom/Photoshop: Use the healing brush on affected areas
  • Capture One: Create a dead pixel profile
  • Free tools: GIMP has excellent clone/healing tools

When to Seek Repair

If you have multiple dead pixels appearing, or if hot pixels show up even at low ISO short exposures, the sensor may be degrading. Contact your camera manufacturer about repair options while under warranty.

Note: Screen vs. Camera Pixels

This guide covers camera sensor issues. If you're looking to check your display/screen for dead pixels, use our Dead Pixel Test Tool instead.