One of the ways you can use the Lens Correction tool is to correct Vertical distortions in a portrait. Open the raw image in Camera Raw select the Lens Correction Pallet and then click on the Manual tab to use the transform sliders. In this image I used the Vertical slider to bring back proper perspective to the image.
Lens Correction Tool
The Lens Correction tool can correct a number of common camera lens distortion flaws such as barrel or pincushion distortion, chromatic aberration and vignetting.
Finished Cropped Image
I set the vertical slider adjustment at +47 to tilt the image back and eliminate the perspective distortion. To correct the darker edges I set the Lens Vignetting slider at +51 which blended the exposure of the perimeter of the image with the center of the image.
The Lens Correction tool can be used in Camera Raw where I processed this image or in CS6 under Filter > Distort > Lens Correction. This tool can correct a number of common camera lens distortion flaws such as barrel distortion, chromatic aberration, vignette, and perspective flaws. In my screen capture I have used the Lens Correction tool to correct the vertical perspective distortion caused when I shoot this picture of my nephew with the camera angled down to include his graduation cake.
Using Lens Correction I transform the perspective of this image in just a few seconds but it took my sister and her husband Joe a lifetime of persistent reinforcement to transform Robert into an Eagle Scout, Honor Student and nice young man.
R. J. I hope you work hard and enjoy college! Love You!!