def mirroringVerticale():
    pict=makePicture(pickAFile())
    width=getWidth(pict)
    mirrorPoint=width/2
    for y in range(getHeight(pict)):
       for x in range(mirrorPoint):
          leftPixel=getPixel(pict, x, y)
          rightPixel=getPixel(pict, width-x-1, y)
          color=getColor(leftPixel)
          setColor(rightPixel, color)
    repaint(pict)

def mirroringOrizzontale():
   pict=makePicture(pickAFile())
   height=getHeight(pict)
   mirrorPoint=height/2
   for x in range(getWidth(pict)):
      for y in range(mirrorPoint):
         uppixel=getPixel(pict, x, y)
         downpixel=getPixel(pict, x, height-y-1)
         color=getColor(uppixel)
         setColor(downpixel, color)
   repaint(pict)

def speculare():
   pict=makePicture(pickAFile())
   h=getHeight(pict)
   w=getWidth(pict)
   for x in range(w/2):
      for y in range(h):
         pixel=getPixel(pict, x, y)
         pixel2=getPixel(pict, w-x-1, y)
         color=getColor(pixel)
         color2=getColor(pixel2)
         setColor(pixel2, color)
         setColor(pixel, color2)
   repaint(pict)