go into photoshop and desaturate then use the reverse rubber over the bit you want. just play around or type into google. there are other ways better ways to do it but thats the easiest. unless dude knows himself. coooooool pics dude
you need photoshope or paint.net etc, use paint.net and select everything useing the mask tool except what i want in colour then click BW. you can then go over it to get better detail