It's usually done with an attached mat (in fact, you can put a slightly bigger solid color mat behind the spotlight mat, to accentuate the splotlight even more). I don't think it makes much difference as to the degree of difficulty in doing a regular spotlight vs the reverse. One will usually be in black and white (or some other neutral colors), and the other will be in color. Usually the spotlit area is the part you do in color. It's an easy technique, and pretty effective.
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