def Pixel_RGB(px): setColor(px, makeColor((getRed (px) / 128) * 255, \ (getGreen(px) / 128) * 255, \ (getBlue (px) / 128) * 255)) return

def Pixel_Negate(px): setColor(px, makeColor(255 - getRed (px), \ 255 - getGreen(px), \ 255 - getBlue (px))) return

def Pixel_Mono(px): Avg = (getRed(px)+ getGreen(px) + getBlue(px))/3 if Avg > 127: setColor (px, white) else: setColor (px,black) return

def Pixel_Gray (px): grayScale = (getRed(px) + getGreen(px) + getBlue(px)) setColor (px, makeColor(grayScale, grayScale, grayScale)) return

def Pixel_Inc_R(px): R = getRed(px) R = R + 20 setRed(px, R) return def Pixel_Dec_R(px): R = getRed(px) R = R - 20 setRed(px, R) return

def Pixel_Inc_G(px): G = getGreen(px) G = G + 20 setGreen(px,G) return def Pixel_Dec_G(px): G = getGreen(px) G = G - 20 setGreen(px,G) return

def Pixel_Inc_B(px): B = getBlue(px) B = B + 20 setBlue(px, B) return def Pixel_Dec_B(px): B = getBlue(px) B = B - 20 setBlue(px, B) return

def Pixel_Lighter(px): R = getRed(px) G = getGreen(px) B = getBlue(px) R = R + 20 G = G + 20 B = B + 20 setRed(px,R) setGreen(px,G) setBlue(px,B) return

def Pixel_Darker (px): R = getRed(px) G = getGreen(px) B = getBlue(px) R = R - 20 G = G - 20 B = B - 20 setRed(px,R) setGreen(px,G) setBlue(px,B) return

def Process(Canvas,FN): for Y in range(getHeight(Canvas)): for X in range(getWidth(Canvas)): FN(getPixel(Canvas,X,Y)) repaint(Canvas) return

def Main(): Message = """Enter a Command. O=Open, S=Save,
8=RGB, - = Negate, 2=Mono,
Q=Quit, "#"=Gray, >=Light, "): Process(Canvas,Pixel_Lighter) elif (Command == "