def showMediaPath():
  setMediaPath()
  # print "Select file C:\\Users\\troy cs100\\football.jpg"
  # print pickAFile()
  pict = makePicture("football.jpg")
  show(pict)

def posterize():
  file = pickAFile()
  pict = makePicture(file)
  
  # loop for all pixels in the picture
  for pixel in getPixels(pict):
    redAmount = getRed(pixel)
    greenAmount = getGreen(pixel)
    blueAmount = getBlue(pixel)

    # modify red value
    if (redAmount >= 100):
      setRed(pixel, 100)

    if (redAmount < 100):
      setRed (pixel, 1)

    # modify green value
    if (greenAmount >= 192):
      setGreen(pixel, 255)

    if (greenAmount < 192):
      setGreen (pixel, 32)

    # modify blue value
    if (blueAmount >= 128):
      setBlue(pixel, 128)

    if (blueAmount < 128):
      setBlue (pixel, 20)

  show (pict)