ImageProducer Methods
	n addConsumer(ImageConsumer ic) This method is used to register an ImageConsumer with the ImageProducer for access to the image data during a later reconstruction of the Image. n removeConsumer(ImageConsumer ic) This method removes the given ImageConsumer object from the list of consumers currently registered to receive image data. n startProduction(ImageConsumer ic) This method   starts an immediate reconstruction of the image data