Next Photoshop will get 64-bit boost--on Windows only

Interesting announcement by Adobe...

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Next Photoshop will get 64-bit boost--on Windows only
Posted by Stephen Shankland 96 comments

Adobe Systems has shared the first scrap of information about its next version of Photoshop, CS4, and it's a doozy: there will be a 64-bit version of the photo-editing software, but only for Windows and not for Mac OS X.

Adobe generally keeps features in the Windows and Mac versions at a level of parity, but that wasn't possible this time around because of a change Apple made last year to the Mac's programming underpinnings, John Nack, Adobe's product manager for Photoshop, said in an interview.

"We're not going to ship 64-bit native for Mac with CS4," Nack said. "We respect Apple's need to balance their resources and make decisions right for that platform. But it does have an impact on developers."

(Read the "What derailed the 64-bit train?" section below if you want more details on why Adobe concluded it had to change plans.)

What does 64 bits get you, anyway? Chiefly, an easier way for a processor and software to use more than 4GB of memory. In addition, the 64-bit versions of Intel and AMD x86 chips incorporate more data storage slots called registers that can improve performance.
But Nack took pains to say that moving to 64 bits, while useful, isn't like flipping a switch that doubles performance.