The most gee-whiz update is the new context-sensitive scaling, which allows you to resize pictures while retaining foreground objects’ scale. Of course, the added under-the-hood elements aren’t the only updates in Photoshop CS4. I got to watch a dialog box for a coffee-break-length period when I asked Photoshop to apply a simple monochrome gradient to my 5.6GB file. And even a system with lots of RAM won’t be able to avoid reading and writing data to your hard disk–a process that still proves time-consuming. Running the 64-bit version will provide little performance benefit other than the ability to address more RAM. For people who do work on very large images, it’s probably more cost-effective to buy more RAM for your PC than to buy large RAID systems, and Photoshop will probably perform better. Adobe says that Photoshop keeps its editing history in RAM for as long as possible, too, so even if you’re working with smaller images but making lots of edits to them, allocating more RAM will help you in that situation as well. Obviously, most people don’t need that sort of capability, but many professional photographers shoot with large- or medium-format cameras with digital backs that can capture nearly 40 megapixels or even higher, and they often create much larger compositions. In the 64-bit version, I was able to create and work with an image of 45,000 pixels by 45,000 pixels, for a total of a little over 2000 megapixels and a 5.6GB file size.
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