Masking: as the name suggests, controls an on the fly edge masking creation that will reduce the sharpening of non-edge areas while concentrating the sharpening on edges-which is a principle of “capture sharpening”. The fact that Camera Raw is creating an edge mask on the fly is very way cool. One should note, however, as with Camera Raw’s Fill Light, setting the Masking control above zero will cause a bit of calculation to be done. By default the Masking is set to zero-meaning no masking and no mask being built.