Straighten, Square and Crop Photo's of Old Photos

[amyearsley]

I've taken a load of photo's of old photo prints. They are not square on the photo's I have taken and some of the photos were not completely flat.

What I want to be able to do is select the four corners of the photo, square up the corners and crop to that size so end up with a nice square off straight photo.

I've tried searching but have been unable to figure this out. Any help would be appreciated.

Thanks
Andrew

[Ofnuts]

Use the perspective tool:

• Set to "Corrective" mode
  
• Drag the handles in the four corners of the image to the corners of what should be square.
  
• Confirm by hitting the "Transform" button.
  

[url=https://docs.gimp.org/en/gimp-tool-perspective.html][/url]

[rich2005]

There is a useful plugin to assist 

ob-align.py https://www.gimp-forum.net/attachment.php?aid=275 download, unzip, pop in your gimp profile C:\Users\your-name\.gimp-2.8\plug-ins

A quick - 2 minute video demo on use





direct link https://youtu.be/X4LembR9Txs