Camera Exposure and imageProcessing Attributes have no effect

aqmah

Hi,
i am trying to use the Qt functionality for changing shutter speed iso etc. But whatever I use changing the Values (in qml) has no effect on the Picture coming from the camera.

For example I tried:

@
camera.stop()
camera.exposure.setManualShutterSpeed(1/itemExposuretime.value)
camera.start()@

and the effect on the camera is nothing (except the camera is restarting for the time of a blink)
If I change the same with bridged Objective C code (referring from qml to a Objective C C++ Hybrid Class using undocumented iOS APIs) it changes the ShutterSpeed as requested.

Is this a bug or did I miss something ?

Thanks,

SGaist

Hi,

Which version of Qt and OS X are you using ?

aqmah

I am using Qt 5.3 and OS X 10.5.8, I already tried it under Qt 5.2.1 and with Windows 7/Mac OS X 10.5.8, Qt 5.2.1/5.3 and Android 4.0/4.2 (all combinations) all with the same result.

SGaist

Then it's likely between a bug and a missing feature. You should go on the "bug report system":http://bugreports.qt-project.org to see if it's something known. If not please open a new report providing a minimal compilable example that reproduce the behavior. In your case, you should also post your little native test app

mvuori

Most likely the camera simply does not support that through Qt. I have a Qt camera app for three different Nokia OSs and none of them support this.

You should check with QCameraExposure::supportedShutterSpeeds whether it is possible.

And of course: always tell what the device is. Someone might already know what it can do.

SGaist

If the libs used by the backend (and the hardware of course) provides a mean to do it then I would say it's a missing feature.