Drop shadows can be added to an image that has an alpha channel. The opacity, color, blur and transformation of the drop shadow can all be adjusted.

Composite.

The Color parameter sets the color of the drop shadow through the use of a standard eyedropper or color picker. The default color is black.

The opacity of the shadow.

The drop shadow is blurred by a fast, quality blur. Go to the Blur node to see how the Blur controls work.

The drop shadow can be manipulated using a Transform. Go to the Transform node to see how it works.