Smoother panning and zooming and fluid canvas rotation
OpenGL display acceleration in Photoshop
Native support for 64-bit on Windows Vista x64
Improved Adobe Photoshop Lightroom workflow
Extended depth of field
New file display options (tabbed document display and n-up views)
New file management and workspaces with Adobe Bridge CS4
Keyboard shortcuts were changed in Photoshop CS4 to make the Macintosh and Windows versions consistent with one another. Setting the zoom to 100% is now also consistent with other applications from Creative Suite 4.