Cleaning up vignettes in scanned 35mm slides:
I used the Lens correction filter in PSCS3 on a smart object layer. In the sample image, the vignette was dense enough to cause a color shift when removed. I overcame this by using the filter on a duplicate smart object layer and changing the layer blending mode to Luminosity.
This procedure can be recorded in an action to run on a batch of images. Then when performing other scan clean up procedures (dust removal) on each image, the vignette correction can be edited if necessary for individual slide variations.


forum discussion http://forums.dpreview.com/forums/read.asp?forum=1006&message=33589798
original image posted by MisterBG