Altering the perspective in Photoshop

Perspective is a powerful compositional tool.…You can create strong receding lines and an intense sense of depth in your image…when you take advantage of perspective.…There are times though, especially with architecture, when you don't want…perspective, when you want vertical lines to be straight rather than…receding into the distance.…If you're shooting with a wide-angle lens, this can be especially problematic.…Fortunately, Photoshop has a great tool for correcting and altering the…perspective in an image.…Here is a building with a perspective problem.…

Actually the building was fine; the problem is that I stood too close to it and…shot with a very short focal length,…that is, a wide-angle lens.…So what I've got now are these lines all receding upwards to a point, a…vanishing point way above the top of my screen, and I would prefer the…building to look square.…That's how it looked in real life.…There are a number of ways that I could have dealt with this.…If I owned a tilt-shift lens, I could have tried shooting with that, but they…