I am an amateur photographer. I use Adobe Lightroom to process my images from RAW to JPEG. But for some reason, the image before and after export looks different.

That is, after I edit my pictures with Lightroom and export/process it, the resulting JPEG image always turn out to be darker than what I see in Lightroom application.

I tried image processing program from Canon, and I still have the same problem.

I am using a newly formatted computer with Windows 7 ultimate, 4 GB of ram, and GeForce 460 Fermi.

Please help!!