B&W with one Color Object

[frozentyme]

I started shooting a lot more B&W recrently and have a couple of picture I would like to leave B&W with the exception of one or two objects in the picture. I have PS 7.0 presently, and wondering if anyone can help me out!! I have seen picture with a monochone or B&W background and a part or piece of the picture with full color. How is that done? By the way, I shoot in RAW.

Thanks

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[reg]

Either desaturate and use the history brush to bring back color or duplicate the background layer, desaturate, and erase through the top layer where you want color.