– How does an iPhone detect your face in Face ID in the dark, but doesn’t let you see a thing on the Camera app when it’s dark?

Question

– How does an iPhone detect your face in Face ID in the dark, but doesn’t let you see a thing on the Camera app when it’s dark?

In: 0

Answer 1

It uses infrared, which humans don’t see. Since it doesn’t generate visible light, there’s nothing to show.

[https://qph.cf2.quoracdn.net/main-qimg-86ec794ea47c1c20402c7921d2723f47-lq](https://qph.cf2.quoracdn.net/main-qimg-86ec794ea47c1c20402c7921d2723f47-lq)

Answer 2

The face detection works with invisible light, which can be picked up by the camera. If you point your camera to the front of an iPhone or even a TV remote, you can see the purple light which can’t be seen with your own eyes.
On the other hand, when you try to take a photo in the dark, it’ll take longer to gather enough light to be able to make an image out of it, and this can’t be done in an instant.

Answer 3

FaceID works off infrared…a “colour” (light frequency) that you can’t see but your phone camera can.

So the camera works just fine in the dark…but in a way that you can’t see so the app still looks dark.