Finally, go to the Adjust menu, and in the Brightness and Contrast menu, select Brightness/Contrast.
You can simply move the brightness slider backward and forward to achieve the vignetting effect. By moving the slider all the way to the left we get a black vignette…
…while all the way to the right produces a white effect.
For a different effect, why not try a blur? Go to the Adjust menu, and under Blur choose Gaussian Blur. This is an attractive and easily adjustable blur effect. Use a heavy blur setting of around 20 or so for a dramatic effect. Photoshop users will find this in the Filter menu.
Once you’ve got the feathered elliptical selection you can use almost any effect to create the vignette effect, so experiment with some of the more unusual features and see what works.