two really bad methods in Blitz:
writpixelfast the scanlines as half the (r g and b) of the read values underneath (BAD)
line a black line where the scanlines are every second frame (ALSO BAD)
writpixelfast the scanlines as half the (r g and b) of the read values underneath (BAD)
line a black line where the scanlines are every second frame (ALSO BAD)