Iris blur in Photoshop. In this tutorial, you will learn how to use the Iris Blur function in Adobe Photoshop CS6. This is a pretty cool tool that lets you retain focus on a certain part of your image, and blur out the rest. Although this is possible to achieve even in the older versions of Adobe Photoshop, however, CS6 comes with more sophisticated features that are more flexible and give you more control over the effect. Kudos to Adobe Photoshop CS6.