Using the Lens Correction Filter in Photoshop
by Lauren Scott
1. Assess the image
In the image we’re working with, the horizon isn’t straight, and the building also appears to bend inwards. We’re going to open up the image in Photoshop and fix some of the basic problems to achieve as more natural looking perspective.
2. Level horizon
To create a level horizon, Go to Filter>Lens Correction, and select the straighten tool. In CS6 this is found to the left hand side of the image. Click and drag the horizon line to level it out, using the grid lines as a guide if this helps you.
3. Reshape curvature
From the custom settings, select the Remove Distortion tool and drag the image from the top edge inwards to bend the horizon until it’s flat.
4. Remove fringing
Zoom in to your image to check whether there’s any colour fringing.
5. Remove vignette
The vignette controls are also in the custom adjustments, used to adjust overly light or dark corners of the image. Again, move the sliders either left or right depending on your image, to remove any lens vignetting.
6. Tilt the perspective
The Transform controls in the filter change the vertical and horizontal perspective of your image. When altering these, be sure to keep checking whether your verticals are straight.
7. Check your angles
After you’ve followed these steps, re-assess the angles in your image. Click on the Show Grid option if you haven’t already to make sure the image’s horizon is level. If not, use the straighten tool to tweak it once more and make it level.
8. Scale the image
You may need to scale your image up or down after you’ve corrected the distortion. Use the scale slider for this, shown in the red selection from step 6.
Save and compare
The final result now has a much more natural perspective, even if the results are subtle. Why not have a go yourself and upload your shots to the DP gallery.