myFile=pickAFile()
picture=makePicture(myFile)
pictureDup=duplicatePicture(picture)
show(picture)
editImage()

def editImage():

  action=requestString("*** Picture Modifications ***\nm - make monochrome (black-and-white image)\nl - make the image Lighter\nd - make the image Darker\nu - undo\no - reset the picture to the Original\nq - quit")


  if (action == "l"):
     for pxl in getPixels(picture):
      color = getColor(pxl)
      color = makeLighter(color)
      setColor(pxl, color)
     repaint(picture)
     editImage()

  elif (action == "d"):
     for pxl in getPixels(picture):
      color = getColor(pxl)
      color = makeDarker(color)
      setColor(pxl, color)
     repaint(picture)
     editImage()

  elif (action == "m"):
     for pxl in getPixels(picture):
      OGColor = (getRed(pxl)+getGreen(pxl)+getBlue(pxl))/3
      setColor(pxl,makeColor(OGColor, OGColor,OGColor))
     repaint(picture)
     editImage()

  elif (action== "o"):
      show(pictureDup)
      editImage()

  elif (action == "q"):
    printNow("quit")