On Monday 28 September 2009 02:59:17 pm Jude T. wrote:
> >Tools > Transformation > Rotate

this should be the first step in straightening out an image with distorted 
perspective, as you get when you don't hold the camera straight. 

after getting _something_ straight, either the middle of the image, or an 
important part somewhere else, you'll have to adjust the perspective. either 
choose tools -> transform tools -> perspective, or the perspective tool from 
the 
toolbox.

you'll have to play around a little to find the ideal perspective shift. if you 
change the perspective too much, the photo will look weired. after adjusting 
the 
perspective you can undo & redo, and repeat the process if necessary.

online manual links:

http://docs.gimp.org/2.6/en/gimp-tool-rotate.html
http://docs.gimp.org/2.6/en/gimp-tool-perspective.html

i didn't see a tutorial dealing with this subject, but you'll find lots of 
helpful information in there: http://gimp.org/tutorials/

-- 
phani.
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