If you're using photoshop, paint.net, etc. you will need a plugin to read dds files.
Thanks DD. Yeah I figured it out but I can't seem to make the photo look decent on the billboard because of the dimensions.
No problem. Are you using a different size canvas in the software and then rescaling it?
So I think what I'm doing wrong is "stretching" the photo versus resizing it in an editor. It's just that I don't really have many pictures that are taken in that panoramic view so I guess I just have to find the right one.