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For technical reasons that escape me, Photoshop uses a 15+1 bit format for 16 bit files. A discussion on the Luminous Landscape < http://luminous-landscape.com/forum/index.php?showtopic=1841 3&view=findpost&p=130315> forum has demonstrated that when one brings a 16 bit file into Photoshop, half the values are set to zero. We now have 14 bits in the new Canon and Nikon cameras and 16 bits in many medium format backs. A bit depth of 15 should be ample for any real photographic needs, but limits the use of Photoshop for analysis of true 16 bit images. I would be interested in comments from Chris Cox or other knowledgeable engineering types.
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