# Assignment One Ellette Cruden 12077709

global picture
global file

def open():
 global picture
 global file
 file=pickAFile()                                                  #To pic your picture
 picture = makePicture(file)
 show(picture)

def render():
 global picture
 selection = requestString("*** Picture Modifications ***\n"                  #This is info box
    "m - make monochrome (black-and-white image)\n"
    "l - make the image Lighter\n"
    "d - make the image Darker\n"
    "u - undo\n"
    "o - reset the picture to the Original\n"
    "q - quit\n\n"
    "Choice:\b")
 if selection == "m":
   monochrome(picture)
 elif selection == "l":
   lighten(picture)
 elif selection == "u":
   undo(picture)
 elif selection == "o":
   reset(picture)



 # request sting then have to come up with "if" statements
 # eg. if request is m then run monochrome


def lighten(picture):
  for px in getPixels(picture):
    color = getColor (px)
    color = makeLighter (color)
    setColor(px, color)
  repaint(picture)

def darken(picture):
  for px in getPixels(picture):
    color = getColor (px)
    color = makeDarker (color)
    setColor(px,color)
  repaint(picture)

def monochrome(picture):
  for px in getPixels(picture):
    value= (getRed(px) + getGreen(px) + getBlue(px))/3
    setRed(px, value)
    setGreen(px, value)
    setBlue(px, value)
  repaint(picture)

def undo(picture):
  picture=backup
  repaint(picture)

def reset(picture):
  picture=makePicture(file)
  repaint(picture)