with open("rgb332.gpl", "w") as f:
      f.write("GIMP Palette\nName: RGB332\nColumns: 16\n#\n")
      for i in range(256):
          r = ((i >> 5) * 255) // 7
          g = (((i >> 2) & 0x7) * 255) // 7
          b = ((i & 0x3) * 255) // 3
          f.write(f"{r:3d} {g:3d} {b:3d} Index {i}\n")