setOption("BlackBackground", true);
newImage("Small-Rect_0-255", "8-bit black", 256, 256, 1);
makeRectangle(100, 120, 115, 60);
demo();
roiManager("delete");
newImage("Big-Rect_0-255", "8-bit black", 256, 256, 1);
makeRectangle(20, 20, 200, 200);
demo();
close("ROI Manager");
exit();
//
function demo() {
   run("Set...", "value=255");
   run("Select None");
   run("Make Binary"); // this makes the difference
   run("Create Selection");
   roiManager("Add");
   roiManager("Select", 0);
   roiManager("translate", 30, 30);
   roiManager("Select", 0);
   run("Add Selection...");
}