I was able to use a simple parabolic correction for vignetting in the Sol 49 anaglyphs. The pixel values of the left and right images were multiplied by a factor of
where r is the radial distance of the pixel from the center of the image then rounded and bounded. Here's an example with α = 0.007. The center of the image is dimmed and the edges are brightened. Different bounds were used for the contrast enhancement. Try clicking on one of the images to enlarge it then use the arrow keys to swith back and forth between the two images to see the changes.