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Explainging the Unsharp Mask - Digital Photography Tip


Photo Tips at Earthbound Light have a great tip on the useful Unsharp Mask in many photo editing software packages:

'To understand what this is all about, we'll need to go back to the beginning. The name has its origins, as do many things photographic, in the conventional darkroom. Creating a print the old-fashioned way involves exposing photosensitive paper by projecting onto it a negative of the desired image. In order to accentuate edges in a print and thus make it look sharper, the darkroom operator made something called an unsharp mask.

The technique consists of creating a weak, slightly out of focus positive transparency of the original negative. Rather than exposing the negative on photographic paper, it is instead exposed on another sheet of film. Thus, this new version will be a positive image. Since we recorded it slightly out of focus, if we sandwich it with the original piece of film, all the edges in the composite image will have slight halos in the exact opposite color of whatever is on the other side of each edge.'






Posted by Darren in our Tips category on April 24, 2005

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