Adobe Photoshop CS4 to be 64-Bit for Windows, 32-Bit for Mac

Adobe's John Nack writes about the future plans for Adobe Photoshop CS4 and CS5, revealing that Adobe Photoshop CS4 will include 64-Bit support, but for Windows only. The Mac version of CS4 will remain at 32-Bit. The reason for the discrepancy, however, is not due to a lack of interest or support from Adobe, but for more practical reasons.

First off, Nack admits that the 64-bit version of Photoshop will see modest speed increases (8-12%) but the biggest advantage will be for those using massive images (a 3.375 gigapixel image is given as an example). With these massive sizes and with enough RAM (32GB given as example), you can see substantial (10x) improvements.

Adobe expects that Mac users will have to wait until CS5 before getting full 64-bit support. The reason for this delay is due to Apple's abrupt dropping of Carbon 64-bit support:

At the WWDC show last June, however, Adobe & other developers learned that Apple had decided to stop their Carbon 64 efforts. This means that 64-bit Mac apps need to be written to use Cocoa (as Lightroom is) instead of Carbon. This means that we'll need to rewrite large parts of Photoshop and its plug-ins (potentially affecting over a million lines of code) to move it from Carbon to Cocoa.

Nack reports that they started working on the transition immediately after the announcement but due to the scope of the transition are unable to deliver it by CS4. He also tries to dispel the notion that Cocoa alone will produce a higher quality product than Carbon:

Most Mac users don't know Cocoa from Ovaltine, and nor should they: it's just an implementation detail, not a measure of quality. I think Brent Simmons, creator of wonderful Cocoa apps like NetNewsWire, put it most elegantly: "Finder + Cocoa = Finder." That is, rewriting one's app in Cocoa doesn't somehow automatically improve its speed, usability, or feature set.

Popular Stories

iPhone 16 Pro Max Generic Feature 2

5 Biggest Changes Rumored for iPhone 16 Pro Max

Tuesday May 21, 2024 7:29 am PDT by
Given Apple's rumored plan to add an all-new high-end tier to its iPhone 17 series in 2025, this could be the year for Apple to bring its boldest "Pro Max" model to the table — the kind of iPhone 16 upgrade that stands tall above its siblings, both figuratively and literally. If you have been holding out for the iPhone 16 Pro Max, here are five of the biggest changes rumored to be coming...
6chatgpt mac app

5 Reasons to Use OpenAI's ChatGPT App for Mac

Thursday May 23, 2024 6:07 am PDT by
On May 13, OpenAI during its Spring Update announced that it would be releasing a desktop ChatGPT app for the Mac in the "coming weeks," and said that ahead of a wider launch it had started rolling out the app to some ChatGPT Plus subscribers. Subscribe to the MacRumors YouTube channel for more videos. After testing the app for a few days, we thought it was worth sharing some reasons why...
macOS 15 Feature

macOS 15 System Settings to Get Design Overhaul

Thursday May 23, 2024 12:51 pm PDT by
With the macOS 15 update that is set to debut at WWDC in June, Apple plans to rearrange "menus and app UIs," according to a report from AppleInsider. The System Settings app, which was last updated with macOS Ventura, will get one of the biggest updates. With macOS Ventura, Apple renamed the System Preferences app to System Settings, introducing a design similar to the Settings app on the...
new best buy blue

Best Buy's Memorial Day Sale Has Record Low Prices on iPads, MacBooks, and Much More

Friday May 24, 2024 7:12 am PDT by
Best Buy today kicked off its Memorial Day weekend sale, and it has some of the best prices we've tracked in weeks on iPads and MacBooks. Specifically, you'll find record low prices on the 5th generation iPad Air, iPad mini 6, M2 MacBook Air, and M3 MacBook Pro. Note: MacRumors is an affiliate partner with Best Buy. When you click a link and make a purchase, we may receive a small payment,...