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 not be used.
Header: wiadef.h (include Wiadef.h)