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top, left = 1, 1

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def montage():
  topLeft = makePicture(getMediaPath("images-1.jpg")) # Top left picture, type in later
  topRight = makePicture(getMediaPath("images-2.jpg")) # Top Right picture, 
  bottomLeft = makePicture(getMediaPath("images-3.jpg")) # Bottom Left picture
  bottomRight = makePicture(getMediaPath("images-4.jpg")) # Bottom right picture
  middlePicture = makePicture(getMediaPath("images.jpg")) # Middle picture
  
  width = getWidth(topLeft)
  height = getHeight(topLeft)
  canvas = makeEmptyPicture(width*3, height*3)

  top = left = 1
  midX = width +1
  midY = height +1
  
  BASE_COLORS = ["red","green","blue"]

  def posterize(pic):  # simplifies the color range
    for pixel in getPixels(pic):
      for color in BASE_COLORS:
         level = 0
         if getColor(color, pixel ) > 127:
              level = 255          
         setColor(color, level)
    return pic

  def grayscale(gPic):  #sets RGB values equal to one another
    for p in getPixels(gPic):
      intensity = (getRed(p) + getGreen(p) + getBlue(p))/3
      setColor(p, makeColor(intensity, intensity, intensity))
    return gPic

  def negative(nPic): # makes all the colors opposite original values
    for px in getPixels(nPic):
      inverse_rgb = [255 - getColor(color, px) for color in BASE_COLORS ]
      setColor(px, makeColor(*inverse_rgb) )
    return nPic

  def sunset(sPic):  # decreases blue and green to add a warmer red tone
    for p in getPixels(sPic):
      for color in ["blue","green"]:
        setColor( getColor( color, p ) * 0.07 )
    return sPic

  def copyPicture(littlePic, bg, x, y):
    for destX in range(getWidth(littlePic)):
      for destY in range(getHeight(littlePic)):
        fromPixel = getPixel(littlePic, destX+1, destY+1)
        destPixel = getPixel(bg, destX+x, destY+y)
        setColor(destPixel, getColor(fromPixel))

  copyPicture(posterize(topLeft), canvas, left, top)
  copyPicture(grayscale(topRight), canvas, midX, top)
  copyPicture(negative(bottomLeft), canvas, left, midY)
  copyPicture(sunset(bottomRight), canvas, midX, midY)
  copyPicture(middlePicture, canvas, midX/2, midY/2)
  return canvas

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getters = [getRed,getGreen,getBlue]
setters = [setRed,setGreen,setBlue]

def posterize(pic):  # simplifies the color range
  for pixel in getPixels(pic):
    for (getter,setter) in zip(getters,setters):
       level = 0
       if getter( pixel ) > 127:
            level = 255          
       setter( pixel, level )
  return pic

def negative(nPic): # makes all the colors opposite original values
  for px in getPixels(nPic):
    inverse_rgb = [255 - getter( px ) for getter in getters ]
    setColor(px, makeColor( *inverse_rgb) )
  return nPic