I use the AVFoundationframework to create a custom camera app.
Is it possible to capture a photo with HDR for a custom camera app, i.e., is HDR somewhere exposed in the camera api?
Jasper
Had the same question and found an answer in this SA question.
HDR is unique to the Camera.app from Apple and is not available to developers through an API.
来源：https://stackoverflow.com/questions/29085088/how-to-use-hdr-with-custom-avfoundation-based-camera-app