Use the Measure tool to straighten out your images (Photoshop CS/CS2/CS3/CS4)

Admit it; you're not always perfect. When scanning images, undoubtedly you've gotten that one scan that was a bit askew when you placed it on the scanner bed. It happens to us all. So, how do you straighten it out?

It's easy; simply use the Measure/Ruler tool. Just drag the tool's pointer along the top edge of your image, then choose Image > Rotate Canvas > Arbitrary. Click OK and Photoshop applies the information from your measurement and straightens things out for you. Now that's perfect.