321,
Photoshop is wonderful bcos u can use several methods to do one thing :
One fast way is:
1) create new layer
2) draw a selection around the object u want to be in colour
3) save the selection
4) Invert selection
5) go to adjustment and selection 'black/white'.
Walah, U got wat u want.
Hope that helps. God bless.:thumbsup:
Gunawan