Remove Vignetting in FCPX

[Brad Hurley]

There’s no easy fix for this kind of vignetting (you can avoid it by ensuring that you don’t use the maximum settings on your variable ND filter; you can screw a fixed ND filter above or below the variable ND to get more light reduction without vignetting). But you could try applying a shape mask, invert it, soften it considerably, and adjust the master or highlights color wheels to make the luma of the area outside the mask more closely match that of the area inside.

[Brad Hurley]

FYI, I found this tutorial (which is for DaVinci Resolve, but most of the basic principles can be applied with FPCX as well): https://www.premiumbeat.com/blog/fix-variable-nd-filter-vignette-davinci-resolve/

Shape masks in FCPX are the equivalent of power windows in Resolve, although Resolve has a lot more options (including built-in tracking). The excellent Advanced Color Grading in Final Cut Pro tutorial from Ripple Training shows you how to apply a vignette, among many other useful techniques; to eliminate vignette you would essentially follow the opposite procedure by (as I noted above) inverting the mask by click the “outside” tab to make changes to shadows/midtones/highlights outside the mask using the color wheels.