![]() Stack Photos to Extend the Depth of Field I’d like to return to that subject this week, because I’ve now found a free program you can use to make photos with an “infinite” depth of field. A few years ago I explained how you could take a series of photos with slightly different focal points and combine them into a single image with very deep depth of field, with everything in focus. That’s still in the lab, but you can use software to fiddle with the depth of field even now. A technique called computational photography, for example, promises to let you change the focus and the depth of field on your PC, so you can make someone in the background of a picture snap into focus. One day you’ll be able to change almost any aspect of a photo after it’s taken.
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