I've taken a bunch of pictures, all containing objects with a white background. They all have this clear vignetting, which I'd like to remove.
Preferably, I'd like to remove the effect automatically, using the lens profile. This turns out to be not so easy: when I use RAW images, the profile is automatically detected. However, when using JPG images the automatic detection does not occur. I've tried both the Photoshop 'lens correction' dialog as well as Camera Raw tool.
My question: is it possible to get the right profile in one way or another or are there other ways to properly remove the vignetting.
Information: Sample image
Adobe Photoshop CS6
Camera Raw 7.1
Canon EOS 450D
Canon EF-S 18-200mm f/3.5-5.6 IS USM