code: public static BufferedImage regions(GrayS32 pixelToRegion , int numRegions , BufferedImage output ) {
  		return VisualizeBinaryData.renderLabeled(pixelToRegion,numRegions,output);
  	}
docs: Draws each region with a random color
  @param pixelToRegion Conversion from pixel to region
  @param numRegions Total number of regions.
  @param output Storage for output image.  Can be null.
  @return Output image.