Scanning QR Codes in Low Light and Glare
Practical fixes when a QR code will not scan because it is too dark, too bright or covered with reflections.
Lighting is the most common reason a QR code will not scan. Both too little and too much light cause trouble.
Low light
In dim places, the camera struggles to see the contrast between modules.
- Turn on the torch if your scanner has one, or use your phone's flashlight if it is available.
- Move nearer to a light source.
- Hold still, since dim light means longer exposure and more blur.
- Ask for the code to be lit, if it is a sign.
Glare
Glossy paper, laminated menus and glass can reflect light straight into the camera.
- Tilt the phone slightly to move the reflection away.
- Change your position so the light source is not behind you.
- Shade the code with your hand.
- Avoid flash on glossy surfaces, as it can make the glare worse.
Bright sunlight
- Step into shade if you can.
- Turn up the screen brightness so that you can see the frame.
- Watch for shadows across the code, as an uneven shadow can hide modules.
Other tips
- Clean your camera lens. Fingerprints cause haze.
- Keep the phone steady.
- Fill the frame with the code, but leave the border visible.
- Try a different angle.
When it still fails
- The code may be damaged or badly printed.
- It may be too small for the distance.
- It may have low contrast.
In these cases, try moving closer or asking the owner for another copy.
Tips
- Adjust the light before the phone.
- Move, tilt, steady.
- Clean the lens.
QR Code Scanner opens straight to the camera, so you spend less time getting ready and more time positioning the code.
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