PhotoShop CS6 lens correction problem

1. Copy the background layer and open the file. Before you start adjusting your photo, it's necessary to first duplicate the background layer. This will allow you to quickly start over if something goes wrong. Select the "Window > Layer" menu to open the layers panel, drag and drop the thumbnail of the locked background layer onto the Create New Layer button to create a copy.

2. Open the filter? Open "Filter>Lens Correction" (in earlier versions, this command was located in "Filter>Distortion>Lens Correction"). By default, you will see a gray grid covering the work, which will interfere with accurately judging the vignetting of the picture. Therefore, cancel the "Show Grid" option below, and now you can clearly see the vignettes around the picture.

3. Brighten the dark corners? Set the vignette amount to +41 to brighten the dark corners of the screen. Doing this will also affect part of the sky that is exposed correctly. To avoid this, set the midpoint to +76. Keep the light blue tint in the sky. Click OK to return to the main interface.

4. Before and after comparison? There are now two layers. The "Background Copy" layer shows the corrected picture. Click the eye icon in front of the layer's thumbnail to toggle the layer's visible state. If you're satisfied with the adjustment results, keep the layer visible and choose Layer > Merge Images.