Having a good photo manipulation software package is important, there are a few excellent packages that are available but obviously your budget will determine which one you go for. Photoshop Elements would be a good start.
With Photo-shop, to judge your horizon you can simply drag a line down or from the side rulers.
Couple of examples:
I use these guides to level up if the horizon is maybe a hill side with buildings using the architecture to level up things a little:
| HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO |
and the horizontal lines for level the horizon in a landscape or with buildings etc.
| HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO |
You can also use both to 'square' things up.
Quick and easy fix to those images that can look a little 'wonky'
