Filename = pickAFile()
print Filename
Canvas = makePicture(Filename)
show(Canvas)
print getWidth(Canvas)
print getHeight(Canvas)

for Y in range(getHeight(Canvas)):
    for X in range(getWidth(Canvas)):
        PX = getPixel(Canvas,X,Y)
        setRed  (PX, getRed(PX)   + 50)
        setGreen(PX, getGreen(PX) + 50)
        setBlue (PX, getBlue(PX)  + 50)
        
    repaint(Canvas)