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How to draw a shadow for a given transparent image?

Platform: WinForms| Category: Bitmaps and Images

The following method will draw a shadow of the supplied image at the specified

The general usage pattern is to call this method first to draw a shadow at a

(2,2) offset from where the original image will be drawn and then draw the

original image itself.

public static void DrawShadow(Graphics g, Image iconImage, int left, int top)
	ImageAttributes ia = new ImageAttributes();
	ColorMatrix cm = new ColorMatrix();
	cm.Matrix00 = 0;
	cm.Matrix11 = 0;
	cm.Matrix22 = 0;
	cm.Matrix33 = 0.25f;
	g.DrawImage(iconImage, new Rectangle(left, top, iconImage.Width, 

iconImage.Height), 0, 0, iconImage.Width, iconImage.Height,
		GraphicsUnit.Pixel, ia);

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