func NewImage(width, height int) *Image {
	i := &Image{
		image: graphicscommand.NewImage(width, height),
	}
	i.clear()
	theImages.add(i)
	return i
}
func NewImage(width, height int) *Image {
	i := &Image{
		image: graphicscommand.NewImage(width, height),
	}
	i.clear()
	theImages.add(i)
	return i
}
// NewImage creates an empty image with the given size.
//
// The returned image is cleared.
//
// Note that Dispose is not called automatically.