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> ## O

> opacity
>   The measure of an object's ability to block light transmission — the opposite of transparency. In DirectAnimation, you set it with the DAImage.Opacity function (or Java ImageBvr.opacity method) or DAGeometry.Opacity function (or Java GeometryBvr.opacity method), respectively. When the opacity is 0, the resulting image or geometry is fully transparent. When the opacity is 1, the image or geometry is fully opaque.
> overlay
>   An overlay takes two images as parameters and returns an image that is made by laying the first image on top of the second. Blending takes place where the images overlap and the image laid on top is partially opaque (neither fully opaque nor fully transparent). To create an overlay, use the DAImage.Overlay function (or Java ImageBvr.overlay method).

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