[Interest] QCamera and QCameraViewFinder

Joshua Grauman jnfo-c at grauman.com
Tue Nov 5 07:14:53 CET 2013

Hello all,

I setup a basic use of QCamera and QCameraViewFinder that work fine. I 
just used the basic example in the docs to capture an image like this:

camera->searchAndLock();      //on half pressed shutter button
imageCapture->capture();      //on shutter button pressed
camera->unlock();             //on shutter button released

and had setup the viewfinder and camera like this:

camera = new QCamera;
viewFinder = new QCameraViewfinder(picture1);
imageCapture = new QCameraImageCapture(camera);
connect(imageCapture, SIGNAL(imageCaptured(int, const QImage &)), this, SLOT(gotImage(int, const QImage &)));

Everything works as expected. The problem is with the exposure settings. 
The viewfinder looks how I want it to (properly exposed). But when I 
capture the image, it is under-exposed (very dark). I was hoping to get 
the picture that is taken to have the same exposure settings as the 
viewfinder since it looks fine. Does anyone know why the default settings 
for QCamera would be under-exposed in comparison to the viewfinder? 


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