by Amy Gebhardt
One of the best methods to create a focal point in an image is to apply a slight blur to the surrounding elements. In a sense, this forces viewers to see what you want them to see, and it’s a subtle enough technique that the blur won’t detract from the overall image. Photoshop’s Lens Blur filter enables you to create more realistic-looking and highly controlled blurs. Let’s take a closer look.
Understanding all of your options
When you first open the Lens Blur dialog box, shown in Figure A, you may feel a bit overwhelmed by all of the different options presented to you. However, it’s these options that allow you to have a great deal of control over any alterations you make to your image. Let’s go over them now.
In the Depth Map section, you can specify the pixels within your image that you want blurred. For example, if you choose None from the Source pop-up menu, then Photoshop applies the blur to every pixel evenly. This is because you aren’t using a depth map; you’re just applying the blur. If you select Transparency, Photoshop applies the blur to the image based on[…]