When you process plenty of photographs, it's useful to have a workflow to make the work systematic and therefore, faster. Also, it ensures that you don't forget to do something to your images before you send them out. There's many ways to go about it and I confess that I don't have a set one. Often the recommended sequence will be something like 1) indexing the images (adding tags for easy searching), 2) initial cropping and cleaning up the image, 3) image adjustments, 4) sharpening, 5) final cropping, and 6) compressing and saving. These steps are highly condensed and vary widely among Photoshop users. Today we're going to tackle something that belongs to step 2: straightening out a picture.
Now, people who work with tripods (and you should really, at least for food pictures) don't usually have this problem, but if you don't have a tripod or if you take travel pictures, it can get frantic and the pictures don't come out straight. Fixing it is extremely easy in Photoshop.
This is also possible for not much more effort in Photoshop Elements.
As always, if you're getting familiarized with these tools, just play with your images (feel free to download my first image of the grocery above). Use vertical lines as your guide. Or maybe turn correct images into lopsided ones. Just get a feel for the tools until it becomes natural!