Is the last Photoshop tutorial I gave instructions for rotating and straightening images but if you want it to be precise, there's another way to do it by using the Ruler Tool. Find 2 points in your image that should be level with each other and using the the Ruler Tool, draw a line between those points or one that borders those 2 points. Go to Image/Rotate Canvas/Arbitrary and click on OK and you're done. Ken