Security cameras
What is WDR on a security camera?
WDR (Wide Dynamic Range) is a camera's ability to show detail in the very bright and very dark parts of a scene at the same time. It matters most against strong backlight: an open front door, a window, or a garage with the sun shining straight in.
The problem it solves
A regular camera sets exposure for the average of the scene. If a bright window sits behind a person, either the window turns white or the person becomes a dark silhouette.
With WDR the camera combines several exposures or processes the image to recover both areas, so you can see the face and what is happening outside.
True WDR versus digital WDR
True WDR uses the sensor to capture multiple exposures and merge them. It is often rated in decibels (dB): a higher number means it handles a bigger gap between light and shadow.
Digital WDR (DWDR) is a software adjustment on a single exposure that lifts shadows and pulls down highlights. It helps, but it struggles with harsh backlight.
What to check before you buy
- If the camera faces a door, window, or entrance that gets sun, WDR makes a real difference.
- Compare the dB rating when the spec sheet lists it; "DWDR" alone means the digital version.
- Indoors with even lighting, WDR matters much less.
Guides to help you choose
Frequently asked questions
The idea is similar: widening the range between highlights and shadows. HDR is the term used for TVs and phones; security cameras usually say WDR.