You will see full intensity of the picture when two polarizer are in the same direction.
[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=497.0;attach=2687[/img]


And you will not see the tiger when those two polarizer are perpendicular to each other.
[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=497.0;attach=2689[/img]