Method getImage

ij/src/main/java/ij/WindowManager.java:249–270

For IDs less than zero, returns the ImagePlus with the specified ID. Returns null if no open window has a matching ID or no images are open. For IDs greater than zero, returns the Nth ImagePlus. Returns null if the ID is zero.

(int imageID)

		For IDs greater than zero, returns the Nth ImagePlus. Returns null if 
		the ID is zero. */
	public synchronized static ImagePlus getImage(int imageID) {
		if (imageID>0)
			imageID = getNthImageID(imageID);
		if (imageID==0 || getImageCount()==0)
			return null;
		ImagePlus imp2 = Interpreter.getBatchModeImage(imageID);
		if (imp2!=null)
			return imp2;
		ImagePlus imp = null;
		for (int i=0; i<imageList.size(); i++) {
			ImageWindow win = (ImageWindow)imageList.get(i);
			imp2 = win.getImagePlus();
			if (imageID==imp2.getID()) {
				imp = imp2;
				break;
			}
		}
		imp2 = getCurrentImage();
		if (imp==null &&imp2!=null && imp2.getID()==imageID)
			return imp2;
		return imp;
	}
	
	/** Returns the ID of the Nth open image. Returns zero if n<=0 
		or n greater than the number of open image windows. */