def chromakey (source,bg):
# source should have something in front of blue
# bg is the new background
  for x in range(0, getWidth(source )):
     for y in range(0, getHeight(source )):
        p = getPixel(source ,x,y)
        # if red + blue  < green
        if (getRed(p) + 10 < getGreen(p)):
           setColor(p,getColor(getPixel(bg ,x,y)))
  return source

def writeTempPic(picture):
  file=r"C:\Documents and Settings\galanos\Desktop\PythonMediaCompWork\riaOnMoon.jpg"
  writePictureTo(picture, file)