[Interest] QCamera and QCameraViewFinder

Lopes Yoann Yoann.Lopes at digia.com
Wed Nov 6 11:55:31 CET 2013

Oh, I overlooked the code sample you provided.

You should listen to the imageAvailable() signal instead of imageCaptured(). What you get from imageCaptured() is just a preview, it's emitted right after the camera sensor captured the image but at this point the final image is not processed yet. That final image is provided by imageAvailable(). You'll notice it's a QVideoFrame and you'll have to convert it to a QImage if that's what you need.

Yoann Lopes
Senior Software Engineer - Digia, Qt
Visit us on: http://qt.digia.com

On Nov 5, 2013, at 7:09 PM, Joshua Grauman wrote:

Sorry, I'm using Qt5.2beta under Linux.


Which platform are you on?

Yoann Lopes
Senior Software Engineer - Digia, Qt
Visit us on: http://qt.digia.com

On Nov 5, 2013, at 7:14 AM, Joshua Grauman wrote:

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?

Interest mailing list
Interest at qt-project.org<mailto:Interest at qt-project.org><mailto:Interest at qt-project.org>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20131106/6b904cc6/attachment.html>

More information about the Interest mailing list