[Plugin: NextGEN Gallery] Image Quality not decent

The thumbnails that are created as you can see on my main page … http://advancedrace.com NSFW are not showing properly as you can see they are hazy, as compared to the author’s demo page … http://nextgen.boelinger.com/ … they are bright and clear
the clarity is not the same …
could some one tell how to achieve that on my page …