def forExample1():
   for indexVariable in range(1,10):
      print indexVariable

def getPixelsExample ():
  file = pickAFile ();
  pict = makePicture(file);
  openPictureTool (pict)

  for pix in getPixels(pict):
     value = getRed (pix);
     newValue = value * 0.5;
     setRed (pix, newValue);

  openPictureTool (pict)

def getPicture():
  file = pickAFile ();
  pict = makePicture(file);
  openPictureTool (pict)

def decreaseRed2 (amount):
  file = pickAFile ();
  pict = makePicture(file);
  openPictureTool (pict)

  for pix in getPixels(pict):
     value = getRed (pix);
     newValue = value * amount;
     setRed (pix, newValue);

  openPictureTool (pict)