# Recipe 12: Making a sunset as three functions

def makeSunset(picture):
  reduceBlue(picture)
  reduceGreen(picture)

def reduceBlue(picture):
  for p in getPixels(picture):
    value=getBlue(p)
    setBlue(p,value*0.7)

def reduceGreen(picture):
  for p in getPixels(picture):
    value=getGreen(p)
    setGreen(p,value*0.7)