2020-01-04
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The Pixel 4 uses an infrared camera for face unlock. And you can use it as a regular camera to take IR pictures and videos!
Andrew Steele's video - Invisible London: https://youtu.be/GSPI6NFSZM0
Camera apps to try:
Open Camera: https://play.google.com/store/apps/details?id=net.sourceforge.opencamera
Some people are reporting better luck with HedgeCam 2:
https://play.google.com/store/apps/details?id=com.caddish_hedgehog.hedgecam2
Tap the button that is normally for switching between front and back camera. Keep tapping until you get to the IR.
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