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Bokeh is an optical effect in which the background of a photo is blurred. This blur is produced by taking photos with a shallow depth of field making the background look softer and the subject look sharper and more vivid. Bokeh occurs in the areas of the photo that are out-of-focus.

If there are highlights in the background they will take on the shape of the lens’s aperture. Most often these specular highlights are circles sometimes hexagonals. You can also use bokeh filters to create all sorts of shapes. Some photographers go as far as blurring the entire photo leaving only the highlights.