# Recipe 17: Convert to greyscale with weights

def greyScaleNew(picture):
  for px in getPixels(picture):
    newRed = getRed(px) * 0.299
    newGreen = getGreen(px) * 0.587
    newBlue = getBlue(px) * 0.114
    #all arguments to makeColor must be integers, not floats!
    luminance = int(newRed+newGreen+newBlue)
    color = makeColor(luminance, luminance, luminance)
    setColor(px, color)