void CBCGPImage::MakeDarker	(	double	dblRatio,
		BOOL	bUseModifyBitmapLuminosity = FALSE
	)

Makes the image darker.

Parameters

dblRatio	The lighting ratio.
bUseModifyBitmapLuminosity	Specifies whether the bitmap luminosity changing algorithm will be used instead of the blending algorithm. By default, this parameter is FALSE.