On a previous post I used this picture as one of the examples. Of course, you didn't see it looking quite like this.
Using the straighten tool helps, but the image is still distorted.
I did a control z and then clicked on the down arrow next to the straighten tool, choosing the perspective tool. A rectangle with nodes in each corner will appear in the center of the image.
I click and held one of the corner nodes and drew it to corner of the image that I will be using to set the perspective.
After moving all four corners into the place, I clicked on the accept button on the presets toolbar.
An image with the correct perspective.
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