An interface for exposure related camera settings. 更多...
| 导入语句： | import QtMultimedia 5.8 |
CameraExposure allows you to adjust exposure related settings like aperture and shutter speed, metering and ISO speed.
It should not be constructed separately, instead the
exposure
property of the a
Camera
should be used.
Camera { id: camera exposure.exposureCompensation: -1.0 exposure.exposureMode: Camera.ExposurePortrait }
Several settings have both an automatic and a manual mode. In the automatic modes the camera software itself will decide what a reasonable setting is, but in most cases these settings can be overridden with a specific manual setting.
For example, to select automatic shutter speed selection:
camera.exposure.setAutoShutterSpeed()
Or for a specific shutter speed:
camera.exposure.manualShutterSpeed = 0.01 // 10ms
You can only choose one or the other mode.
This property holds the current lens aperture as an F number (the ratio of the focal length to effective aperture diameter).
另请参阅 manualAperture and setAutoAperture() .
This property holds the adjustment value for the automatically calculated exposure. The value is in EV units.
This property holds the camera exposure mode.
The mode can be one of the following:
| 值 | 描述 |
|---|---|
| Camera.ExposureManual | 手动模式。 |
| Camera.ExposureAuto | 自动模式。 |
| Camera.ExposureNight | 夜间模式。 |
| Camera.ExposureBacklight | 背光曝光模式。 |
| Camera.ExposureSpotlight | 聚光灯曝光模式。 |
| Camera.ExposureSports | 亮点曝光模式。 |
| Camera.ExposureSnow | Snow exposure mode. |
| Camera.ExposureBeach | Beach exposure mode. |
| Camera.ExposureLargeAperture | Use larger aperture with small depth of field. |
| Camera.ExposureSmallAperture | Use smaller aperture. |
| Camera.ExposurePortrait | 肖象曝光模式。 |
| Camera.ExposureAction | Action exposure mode. Since 5.5 |
| Camera.ExposureLandscape | Landscape exposure mode. Since 5.5 |
| Camera.ExposureNightPortrait | Night portrait exposure mode. Since 5.5 |
| Camera.ExposureTheatre | Theatre exposure mode. Since 5.5 |
| Camera.ExposureSunset | Sunset exposure mode. Since 5.5 |
| Camera.ExposureSteadyPhoto | Steady photo exposure mode. Since 5.5 |
| Camera.ExposureFireworks | Fireworks exposure mode. Since 5.5 |
| Camera.ExposureParty | Party exposure mode. Since 5.5 |
| Camera.ExposureCandlelight | Candlelight exposure mode. Since 5.5 |
| Camera.ExposureBarcode | Barcode exposure mode. Since 5.5 |
| Camera.ExposureModeVendor | The base value for device specific exposure modes. |
This property holds the sensor's ISO sensitivity value.
This property holds the aperture (F number) value for capturing photos.
If the value is less than zero, the camera automatically determines an appropriate aperture value.
This property holds the ISO settings for capturing photos.
If a negative value is specified, the camera will automatically determine an appropriate value.
另请参阅 iso and setAutoIsoSensitivity() .
This property holds the shutter speed value (in seconds). If the value is less than zero, the camera automatically determines an appropriate shutter speed.
shutterSpeed , setAutoShutterSpeed()
This property holds the camera metering mode (how exposure is balanced).
The mode can be one of the following:
| 值 | 描述 |
|---|---|
| Camera.MeteringMatrix | A matrix of sample points is used to measure exposure. |
| Camera.MeteringAverage | An average is used to measure exposure. |
| Camera.MeteringSpot | A specific location ( spotMeteringPoint ) is used to measure exposure. |
This property holds the camera's current shutter speed value in seconds. To affect the shutter speed you can use the manualShutterSpeed property and setAutoShutterSpeed() .
The property holds the frame coordinates of the point to use for exposure metering. This point is only used in spot metering mode, and it typically defaults to the center
(0.5, 0.5)
.
Turn on auto aperture selection. The manual aperture value is reset to -1.0
Turn on auto ISO sensitivity selection. The manual ISO value is reset to -1.
Turn on auto shutter speed selection. The manual shutter speed value is reset to -1.0
