Wiki says:
CS4 features smoother panning and zooming, allowing faster image
editing at a high magnification. The interface is more simplified with
its tab-based interface[51]
making it cleaner to work with. Photoshop CS4 features a new 3D engine
allowing the conversion of gradient maps to 3D objects, adding depth to
layers and text, and getting print-quality output with the new
ray-tracing rendering engine. It supports common 3D formats; the new
Adjustment and Mask Panels; Content-aware scaling (seam carving[52]); Fluid Canvas Rotation and File display options.[53] The Content-aware scaling allows users to intelligently size and scale images,[51] and the Canvas Rotation tool makes it easier to rotate and edit images from any angle.[51]
Adobe released Photoshop CS4 Extended, which has the features of
Adobe Photoshop CS4, plus capabilities for scientific imaging, 3D,
motion graphics,[51] accurate image analysis[51]
and high-end film and video users. The faster 3D engine allows users to
paint directly on 3D models, wrap 2D images around 3D shapes and
animate 3D objects.[51] As the successor to Photoshop CS3, Photoshop CS4 is the first x64 edition of Photoshop on consumer computers for Windows.[54] The color correction tool has also been improved significantly.[51]
CS4 and CS4 Extended were released on October 15, 2008.[51] They were also made available through Adobe’s online store and Adobe Authorized Resellers.[51] Both CS4 and CS4 Extended are offered as either a stand-alone application or feature of Adobe Creative Suite 4. The price for CS4 is US$699 and the extended version is US$999.[51] Both products are compatible with Intel-based Mac OS X and PowerPCs, supporting Windows XP and Windows Vista.[51]
made portable for easy in use, just extract, no need to install, you can put it on removable disk and use it.
for windows vista and 7 you need to run as administrator for the first time.
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