Adobe Photoshop CC for Photographers
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Lens Blur
If you want to make a photograph appear realistically out of focus, it is not just a matter of making the detail in the image more blurred. Consider for a moment how a camera lens focuses a viewed object to form an image that is made up of circular points on the film/sensor surface. When the radius of these points is very small, the image is considered sharp and when the radius is large, the image appears to be out of focus.
It is also particularly noticeable the way bright highlights tend ...
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