Neil, quite simple process inside Photoshop
Using your Lasso tool, or the polygonal Lasso tool, draw a nice big circle around the area you want to make black and white. It doesn't have to be exact at all.
Then, go to Image > Adjustments > Desaturate
http://www.nathanledet.com/GolliGeddes01.jpg
http://www.nathanledet.com/GolliGeddes02.jpg









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