A key for the amount to boost the shadow areas of the image. The associated value must be an NSNumber object that specifies floating-point value. The value has no effect if the image used for initialization is not RAW.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)