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Composites an overlay image with alpha channel into the input image (which must have alpha channel) using ‘over’ alpha compositing blend mode. This API requires both images to have the same dimensions. References: - http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending - https://github.com/jcupitt/ruby-vips/issues/28#issuecomment-9014826 See #97.