switchRedOnBlue

def switchRedBlue(pict,k):
# @param pict: Picture
# @param k: int
  for p in getPixels(pict):
    x = getX(p)
    if x < k:
      oRed = getRed(p)
      oBlue = getBlue(p)
      setRed(p,oBlue)
      setBlue(p,oRed)