This is one of over 5964 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
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This snippet illustrates one potential method for achieving perspective. It provides a relatively robust solution, without severe scooping at most fields of view and tilt angles. The left nodes on the chain are curve voodoo to correct for curvature distortion. The right side (with all the gradients) is building out our perspective offset. At the end, we replace the background, since it's junk. If you can create this same filter, with the same robustness and fewer nodes, feel free to give it a shot!
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.