Fully Automatic

<img-wit src="http://upload.wikimedia.org/wikipedia/commons/8/82/2011_Trampeltier_1528.JPG"></img-wit>

20% of screen size

<img-wit src="http://upload.wikimedia.org/wikipedia/commons/8/82/2011_Trampeltier_1528.JPG" pc="20"></img-wit>

Image is 300px Wide

<img-wit src="http://upload.wikimedia.org/wikipedia/commons/8/82/2011_Trampeltier_1528.JPG" w="300"></img-wit>

Create 200x200px Thumbnails with Black Letterboxes/Pillarboxes

<img-wit src="http://upload.wikimedia.org/wikipedia/commons/8/82/2011_Trampeltier_1528.JPG" w="200" h="200" m="letterbox_000000_100"></img-wit>