• Adjust images in half the time
  Use the new Adjustments panel and fluid on-image controls in Adobe® Photoshop® CS4 to make changes in less than half the time* required when using Adjustment layers, menu commands, and dialog boxes in earlier versions of Photoshop.
  
  
• Enjoy smoother rotation, panning, and zooming
  Simply click and drag to turn your canvas for distortion-free viewing at any angle. Gracefully navigate to any area of an image with ultra-smooth zooming and panning. Photoshop CS4 leverages newer computer processors for dramatic boosts in performance.
  
  
• Bypass cropping and retouching with intelligent Content-Aware Scaling
  Use revolutionary Content-Aware Scaling to automatically recompose an image as you resize it, smartly preserving vital areas as the image adapts to different aspect ratios. Get the perfect image in one step without time-intensive cropping and retouching.
  
  
• Composite images in seconds for panoramas or extended-focus photos
  Automatically stitch horizontal or vertical photos to create seamless panoramas using Photomerge® technology. Combine a series of shots with different focal points into a single color-corrected image with automatic correction for vignettes and lens distortion.
  
  
• Easily apply localized changes to camera raw images Time-saver
  Make localized changes — even gradient-based adjustments — to camera raw images with ease. Simply paint the area to be affected, and then use sliders to control the change. Corrections are nondestructive, so your original files are maintained in their pristine state.
  
  
• Find, preview, and manage images with greater efficiency Time-saver
  Discover faster performance and enhanced navigation tools in Adobe Bridge CS4. Operations from startup to handing off of images to Photoshop are faster, and convenient new workspace buttons let you instantly jump to the right display for every task.
  
  

Windows

• 1.8GHz or faster processor
• Microsoft® Windows® XP with Service Pack 2 (Service Pack 3 recommended) or Windows Vista® Home Premium, Business, Ultimate, or Enterprise with Service Pack 1 (certified for 32-bit Windows XP and 32-bit and 64-bit Windows Vista)
• 512MB of RAM (1GB recommended)
• 1GB of available hard-disk space for installation; additional free space required during installation (cannot install on flash-based storage devices)
• 1,024x768 display (1,280x800 recommended) with 16-bit video card
• Some GPU-accelerated features require graphics support for Shader Model 3.0 and OpenGL 2.0
• DVD-ROM drive
• QuickTime 7.2 software required for multimedia features
• Broadband Internet connection required for online services*

Mac OS

• PowerPC® G5 or multicore Intel® processor
• Mac OS X v10.4.11–10.5.4
• 512MB of RAM (1GB recommended)
• 2GB of available hard-disk space for installation; additional free space required during installation (cannot install on a volume that uses a case-sensitive file system or on flash-based storage devices)
• 1,024x768 display (1,280x800 recommended) with 16-bit video card
• Some GPU-accelerated features require graphics support for Shader Model 3.0 and OpenGL 2.0
• DVD-ROM drive
• QuickTime 7.2 software required for multimedia features
• Broadband Internet connection required for online services*