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Chapter 14. Manipulating Images with Filters > Using the Lens Blur Filter

Using the Lens Blur Filter

The Lens Blur filter creates a varying depth of field so that certain objects stay in focus and others areas become blurred. What stays in focus and what blurs is determined by a user-defined selection or alpha channel. When the filter is activated, a depth map is created to determine the 3-dimensional position of the pixels in an image. If you use an alpha channel, the black areas in the alpha channel are at the front of the photo, and the white areas are in the distance. Experiment with selections and alpha channel masks to see how precisely you can control the visual effect of blurring in an image.


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