Yesterday, John Nack—senior product manager for Adobe Photoshop—announced on his blog
that there would be 64-bit support for Photoshop and Lightroom. The Lightroom 2 beta, which Adobe released yesterday, has 64-bit support for both Mac and Windows, so naturally, the question comes up about whether the next version of Photoshop will also be 64-bit for both platforms.
The answer, as John points out, is no, not for CS4. Nack said Photoshop CS4 will be 64-bit for Windows and 32-bit for Mac OS X.
While this might irk some, as John Gruber at Daring Fireball points out
, going from 32-bit (Carbon) to 64-bit (Cocoa) is no easy task, even for a company the size of Adobe.
To steal a line from This is Spinal Tap
, because 11 is one more than 10, doesn't necessarily mean that 64-bit apps are twice as fast as 32-bit apps. There's a bit of complex math that goes into what all that means, and John Nack points it out quite well in his blog post.