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WIA_DPC_EXPOSURE_COMP

The WIA_DPC_EXPOSURE_COMP property enables you to adjust the set point of a digital camera's auto-exposure control.

Property Type: VT_I4

Valid Values: WIA_PROP_RANGE or WIA_PROP_LIST

Access Rights: Read/write

Remarks

You can use the WIA_DPC_EXPOSURE_COMP property to adjust the set point of a digital camera's auto-exposure control. Setting WIA_DPC_EXPOSURE_COMP to zero does not change the factory-set auto-exposure level.

The units of WIA_DPC_EXPOSURE_COMP are in "stops" that are scaled by a factor of 1000, to allow for fractional stop values. Setting WIA_DPC_EXPOSURE_COMP to 2000 corresponds to two stops more exposure (four times more energy on the sensor), so images will be brighter. Setting WIA_DPC_EXPOSURE_COMP to −1000 corresponds to one stop less exposure (one-half the energy on the sensor), so images will be darker.

The setting values are in Additive System of Photographic Exposure (APEX) units.

This property may be expressed as either a list or a range of values. This property is typically used only when a device has the WIA_DPC_EXPOSURE_MODE property set to EXPOSUREMODE_MANUAL.

Requirements

Version

Obsolete in Windows Vista and later operating systems and should no longer be used. However, this property is still defined in Windows Vista for compatibility with applications and devices designed for Windows Server 2003, Windows XP, and previous versions of Windows.

Header

Wiadef.h (include Wiadef.h)

See also

WIA_DPC_EXPOSURE_MODE

 

 

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