I have to agree with David and Sozo on this...
The first tool I would go to, before a plugin, would be to try
Layers --> "Rotate/Zoom"
Frankly I think it shouldn't be under "Layer", but under "Adjustments"
and I also think maybe it's not the best name for a complicated tool...
maybe it should be called "Rotate/Zoom/Roll" or "Rotate/Zoom/Skew"
Anyway,
what you're looking for are THE SECOND TWO SLIDERS FROM THE TOP,
under Roll/Rotate.
THEY WORK TOGETHER.
The 2nd sets the angle or direction of the skew, the 3rd sets the severity.
On the angle, 0 degrees is right or 3 o'clock. 90 is down, or 6 o'clock. etc.
When I'm shooting pics of pages with my cell phone and correcting these, this is what I use the most.
If you adjust the 2nd slider, without adjusting the 3rd, you will not see any difference, Or you can just start with the 3rd.
And if you really want to get complicated, you can actually use the sphere on the left by clicking and dragging.
For those of you who are like me and think this should be built in and not have to delve into the world of add-ons... it is...
I hope this helps.
