Making the Most of Your Photo's Bokeh

15.02.2011
Photographers spend a lot of time eliminating blur from their photos. Auto-focus, vibration reduction, tripods... all of these things help us get sharper images. But blur can be good too--especially in the background, so we can lead the viewer's eye back to the subject in the foreground. Last week, in "," I explained that blur itself comes in different flavors. This quality, known as bokeh, makes some blur more aesthetically pleasing than others. This week, let's wrap up the discussion of blur and bokeh with some tips on how to vary and improve the blur in your own photos.

As I explained last week, bokeh refers to the character of the blur itself, which generally means the shape and crispness of the blurry elements. The blur in your photos is affected by the lens--primarily, the design of the optics and the aperture.

The result is that you can actually see the shape of the lens aperture in your blurry backgrounds (especially in light sources and reflections). Of course, lenses tend to be round, so these blurry spots are generally round as well--but they can be geometric, depending upon the number and arrangement of blades in the lens aperture.

Of course, you've probably figured out by now that you can't do much about the overall quality of the bokeh created by your lens. Your lens is constructed a certain way. It has a given number of blades, for example, and the blades have an unalterable shape that contributes to the bokeh (as well as the optics of the glass elements). You can't open up the lens and change the blades to modify the look of the blur.

That said, you can affect the bokeh by your choice of aperture. The relative size of each blurry element in the background is determined by your f-stop. Choose a wider aperture, and you'll get more blur, and hence, more bokeh. , shot with different f-stops.

Your choice of background also plays a role. Bokeh is significantly more pronounced when you shoot bright lights, so including lots of contrast in your background--with lights and reflections--will give you a more noticeable effect. (I should point out that more is not always better. I'm explaining how to vary the effect, but it's up to you to decide how much of it you want to get in your photo.)

Want to get different--or "better"--bokeh in your photos? If you have a digital SLR, you might shop for lenses that produce nicer bokeh. In the last few years, I've noticed that reviewers have put a lot more emphasis on the quality of the bokeh in lens reviews, so keep an eye out for that.

But rather than spending a ton of money on a new lens, here's a much more practical option: Just fake it. After all, this is digital photography we're talking about, where you can have Nixon shake hands with Bigfoot and put your kids in Apollo moon landing photos. So it should come as no surprise that it's a snap to dress up the bokeh in your photos.

If you are serious about tweaking your backgrounds, look no further than Alien Skin's , a special-effects plug-in for Adobe Photoshop, Adobe Lightroom, Photoshop Elements, and Corel Paintshop Pro. Bokeh 2 gives you tremendous power to fiddle with the blur in your photos. , ready to enhance your blur.

Remember when I showed you all those different kinds of bokeh last week, such as five-blade, nine-blade, and catadioptric effects? I'll fess up: I simulated all of those effects in Bokeh 2, since I don't actually have access to a warehouse full of lenses. Bokeh 2 doesn't stop there, though; you can also apply other shapes, like three-blades aperture and even hearts, as you see .

You can also boost the brightness in light sources to emphasize the bokeh effect, and apply other tricks like swathing your photo in a gentle vignette.

Bokeh 2 costs $199, which is more than many photo editors--but it's well worth the investment if you want to fine-tune the look of your photos. You can try it free for 30 days.

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