ImageProducer Methods
naddConsumer(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. nremoveConsumer(ImageConsumer ic) This method removes the given ImageConsumer object from the list of consumers currently registered to receive image data. nstartProduction(ImageConsumer ic) This method   starts an immediate reconstruction of the image data