Focus stacking

Focus stacking – also called focal plane merging, z-stacking, focus bracketing or focus blending – is a digital image processing technique which combines multiple images taken at different focus distances to give a resulting image with a greater depth of field (DOF) than any of the individual source images. Focus stacking can be used in any situation where individual images have a very shallow depth of field; macro photography and optical microscopy are two typical examples. Focus stacking can also be useful in landscape photography.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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