BlackLevelAuto
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"Off"
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Black level is manually controlled using BlackLevelRaw or BlackLevelAbs
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"Once"
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The camera sets the optimal black level and returns to the "Off" state
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"Continuous"
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The camera constantly adjusts the black level
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pValue [out, retval]
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Pointer to the string specifying the black level control mode
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Value [in]
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The black level control mode to be set
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S_OK
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Success
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E_NOINTERFACE
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The feature is not available for the selected camera
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E_INVALIDARG
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The value is not part of the enumerated set
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E_FAIL
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Failure to set the feature value
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