damn pixels

i just recently bought an awesome computer... the video card is really great.

i've installed bsplayer and all the kazaa lite codec pack.

i've noticed that on full screen there are pixels that weren't there before... there was something in bsplayer that made the pixels go away on full screen, something that smoothed out the lines and made them less harsh..

that was really cool. that's what distinguished bsplayer from the other players. i was wondering what this change is due to...
hardware?
something within bsplayer?
a part of the k-lite codec pack i need to activate?