//  Creates a circular 0 and 1 mask and paste/multiplies
//  it into four different locations in an image.

  requires("1.30l");
  size = 256;
  run("New...", "name=Ramp type=8-bit fill=Ramp width="+size*2+" height="+size*2);
  run("New...", "name=Mask type=8-bit fill=Black width="+size+" height="+size);
  selectWindow("Mask");
  makeOval(size*0.1, size*0.1, size*0.8, size*0.8);
  setColor(1);
  fill();
  makeRectangle(0,0,size,size);
  run("Copy");
  selectWindow("Ramp");
  setPasteMode("Multiply");
  makeRectangle(0,0,size,size); run("Paste");
  makeRectangle(size,0,size,size); run("Paste");
  makeRectangle(size,size,size,size); run("Paste");
  makeRectangle(0,size,size,size); run("Paste");