<https://nch.invisionzone.com/topic/38201-old-movies-too-bright-in-center-is-there-a-gradient-brightness-tool-to-compensate/#comment-101011>
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"Hi\n \n\n\n\tThis is a defect which is quite difficult to remedy and VP doesn't have any filters to do this.  Probably the best result obtainable is by using the Auto Levels effect. Although in principle it would seem simple to add a graded image of a vignette, VP doesn't add or subtract the image from the defective one as in some photo correction programs. There are some vignette images such as this you can try......\n \n\n\n\t \n\n\n\tYou can copy and play with. It would need to be placed on Track 2 and made Negative with Contrast and Transparency adjusted.......but don't expect too much.......or more realistically don't expect any real improvement.\n \n\n\n\tIt's worth a play with though.. An alternative approach is to add the same clip to the upper track and apply the Negative effect, then use Contrast and Transparency to reduce the centre and lighten the corners in Sequence Preview.  Finally create a sequence, load it back and then alter contrast/exposure........Might work but I doubt it. You can nullify the main image as you are using a negative one above it but altering the brightness or contrast of this might have some mileage. In most attempts I have made the result is pretty muddy!\n \n\n\n\tNat\n \n"
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