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In photography, bokeh is one of the most incredible implementations of Aperture. The shallow depth of field causes any light in the background to blur into a floating orb.
In this tutorial, we go through how to create bokeh using Photoshop, with incredible results.
You can also have a look at http://www.photoguides.net/photoshopping-digital-bokeh for the original guide, as well as the Photoshop source files and a high quality download of this tutorial.