search

BradLarson / GPUImage

An open source iOS framework for GPU-based image and video processing
http://www.sunsetlakesoftware.com/2012/02/12/introducing-gpuimage-framework
BSD 3-Clause "New" or "Revised" License
20.23k stars 4.61k forks source link

Front-facing camera takes photos extremely underexposed #1352

Open canpoyrazoglu opened 10 years ago

canpoyrazoglu commented 10 years ago

I am creating an iOS camera app that can take both front-facing and back-facing shots. There is no problem with back facing shots. However, when I try to take an image with the front facing camera, the photo in preview (GPUImageView) displays perfectly:

img_1156

When I take the image, the resulting image is extremely dark, almost black:

img_1158

I am alpha-blending the raw camera input with a camera->lookup filter's result. I've seen this post: https://github.com/BradLarson/GPUImage/issues/907 however, the trying the answer didn't make any difference for me. The camera, including the front camera, used to work perfectly before. I haven't worked on the project for a while, and now it's the result. What could be the reason?

canpoyrazoglu commented 10 years ago

I've found that it's about the setSessionPreset: just before taking the photo. I was calling setSessionPreset: to change the preset just before taking the photo, to be able to preview realtime at low resolution at high framerate, and capture at high resolution. I've found that in iOS 7 the practice has changed: http://stackoverflow.com/questions/19579962/unable-to-set-session-preset-while-capture-session-running-in-ios-7.

I will try the new approach now.

NS456 commented 10 years ago

Having the same problem, but the linked item didn't help (tho may not have implemented correctly). Were you able to solve it?