The following screencast “Selective Coloring with Lightroom 2” by Kelly Anne on Vimeo shows you how to do selective coloring in Adobe Lightroom. A selectively colored photograph is one in which attention is drawn to the subject using color, often done by either desaturating the rest of the frame, or making it completely grayscale.

Kelly Ann’s process is to desaturate the entire photo with the adjustment brush, then use the eraser to erase the desaturation from the subject.

Link via Digital Photography School.