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Camera Exposure and imageProcessing Attributes have no effect

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  • A Offline
    A Offline
    aqmah
    wrote on last edited by
    #1

    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,

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Which version of Qt and OS X are you using ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      0
      • A Offline
        A Offline
        aqmah
        wrote on last edited by
        #3

        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.

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        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          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

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • M Offline
            M Offline
            mvuori
            wrote on last edited by
            #5

            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.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              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.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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