*** A feature request. It would be very helpful to fix video's, esp. old home movies, with a bright hot spot, hard light, in the center and dark edges due to the old lighting available in the 50's and 60's . Something like "reverse vignetting" effect, opposite to the "vignetting effect" already in Kdenelive. Something that would darken the center and lighten the edges, with adjustable softness for the center and edge. A circular "mask" would probably be best, but the ability to draw a custom mask shape would allow a much better repair. I have many old (50-60+ years old) I'd like to give to my kids, nieces, and nephews with the problem. Thanks very much for your consideration. ***