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Depth

lets you choose whether to convert to an 8-bit/channel image or a 16-bit/channel one. A 16-bit/channel file requires twice as much storage space on disk as an 8-bit/channel one, but it provides 128 times as many tonal steps between black and white, so it offers much more editing headroom. See the sidebar “The High-Bit Advantage,” later in this chapter, for more on the pros and cons of 8-bit/channel and 16-bit/channel modes.


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