LIGHTROOM
STEP BY STEP USE THE RADIAL GRADIENT
Draw attention to your subject by darkening the corners of the frame
01 SELECT RADIAL GRADIENT
Open the Start.jpg start image then go to the Masking icon in the toolstrip under the Histogram, and select the Radial Gradient option from the list. Alternatively, you can use the shortcut Shift+M to activate the tool without going through the two clicks needed to get to it.