QCameraExposureControl

The QCameraExposureControl class allows controlling camera exposure parameters. More…

Detailed Description

The QCameraExposure class is the usual method of adjusting exposure related parameters when using camera functionality. This class provides a more complete but less easy to use interface, and also forms the interface to implement when writing a new implementation of QCamera functionality.

You can adjust a number of parameters that will affect images and video taken with the corresponding QCamera object - see the ExposureParameter enumeration.

The interface name of QCameraExposureControl is org.qt-project.qt.cameraexposurecontrol/5.0 as defined in QCameraExposureControl_iid .

See also

QCameraExposure QCamera

class PySide2.QtMultimedia.QCameraExposureControl([parent=None])

param parent:

PySide2.QtCore.QObject

Constructs a camera exposure control object with parent .

PySide2.QtMultimedia.QCameraExposureControl.ExposureParameter

Constant	Description
QCameraExposureControl.ISO	Camera ISO sensitivity, specified as integer value.
QCameraExposureControl.Aperture	Lens aperture is specified as an qreal F number. The supported apertures list can change depending on the focal length, in such a case the exposureParameterRangeChanged() signal is emitted.
QCameraExposureControl.ShutterSpeed	Shutter speed in seconds, specified as qreal.
QCameraExposureControl.ExposureCompensation	Exposure compensation, specified as qreal EV value.
QCameraExposureControl.FlashPower	Manual flash power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no flash and 1.0 corresponds to full flash power.

This value is only used in the manual flash mode .

Constant	Description
QCameraExposureControl.TorchPower	Manual torch power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no light and 1.0 corresponds to full torch power.

This value is only used in the torch flash mode .

Constant	Description
QCameraExposureControl.FlashCompensation	Flash compensation, specified as qreal EV value.
QCameraExposureControl.SpotMeteringPoint	The relative frame coordinate of the point to use for exposure metering in spot metering mode, specified as a QPointF .
QCameraExposureControl.ExposureMode	Camera exposure mode.
QCameraExposureControl.MeteringMode	Camera metering mode.
QCameraExposureControl.ExtendedExposureParameter	The base value for platform specific extended parameters. For such parameters the sequential values starting from should be used.

PySide2.QtMultimedia.QCameraExposureControl.actualValue(parameter)

Parameters:

parameter – ExposureParameter

Return type:

object

Returns the actual exposure parameter value, or invalid QVariant() if the value is unknown or not supported.

The actual parameter value may differ for the requested one if automatic mode is selected or camera supports only limited set of values within the supported range.

PySide2.QtMultimedia.QCameraExposureControl.actualValueChanged(parameter)

Parameters:

parameter – int

PySide2.QtMultimedia.QCameraExposureControl.isParameterSupported(parameter)

Parameters:

parameter – ExposureParameter

Return type:

bool

Returns true is exposure parameter is supported by backend.

PySide2.QtMultimedia.QCameraExposureControl.parameterRangeChanged(parameter)

Parameters:

parameter – int

PySide2.QtMultimedia.QCameraExposureControl.requestedValue(parameter)

Parameters:

parameter – ExposureParameter

Return type:

object

Returns the requested exposure parameter value.

PySide2.QtMultimedia.QCameraExposureControl.requestedValueChanged(parameter)

Parameters:

parameter – int

PySide2.QtMultimedia.QCameraExposureControl.setValue(parameter, value)

Parameters:

• parameter – ExposureParameter

• value – object

Return type:

bool

Set the exposure parameter to value . If a null or invalid QVariant is passed, backend should choose the value automatically, and if possible report the actual value to user with actualValue() .

Returns true if parameter is supported and value is correct.