GPU and OpenGL features and preferences | Photoshop and Bridge | CS5, CS4

• Scrubby Zoom. See Zoom continuously in Photoshop CS5 Help.
• Heads Up Display (HUD) color picker. See Choose a color while painting in Photoshop CS5 Help.
• Color sampling ring. See Choose colors with the Eyedropper tool in Photoshop CS5 Help.
• Brush dynamic resize and hardness control. See Resize or change hardness of cursors by dragging in Photoshop CS5 Help.
• Bristle Brush tip previews. See Bristle tip shape options in Photoshop CS5 Help.
• Rule of thirds crop grid overlay. See Crop images in Photoshop CS5 Help.
• Repoussé. See Create 3D repoussé (Photoshop Extended) in Photoshop CS5 Help.
• 3D overlays. Includes the ground plane, light guides, and bounding boxes for mesh and materials. See 3D panel overview (Photoshop Extended) in Photoshop CS5 Help.

• Zoom enhancements. Smooth display at all zoom levels and temporary zoom. See Zoom continuously and Temporarily zoom an image. 
• Animated transitions for one-stop zoom. Press Ctrl+Plus Sign (Windows) or Command+Plus Sign to zoom, and the image animates slightly between zoom levels. The zoom can be subtle.
• Flick-panning. Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS). In the General panel, select Enable Flick Panning. Then, select the Hand tool and click-flick the image, like a flick gesture on an iPhone. The image glides smoothly to the new position. 
• Rotate the canvas. See Use the Rotate View tool in Photoshop CS5 Help.
• View nonsquare pixel images. See Adjust pixel aspect ratio in Photoshop CS5 Help.
• Pixel grid. A pixel grid appears when zooming in more than 500% on an image. See Hide the pixel grid in Photoshop CS5 Help.
• Adobe Color Engine (ACE). Color conversions are faster because the GPU handles the processing instead of the CPU.
• Draw Brush tip cursors. Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS). In the Cursors panel, choose a Brush Preview color. Then, when you interactively adjust the size or hardness of the Brush tool, the preview color displays the change in real time.  See Resize or change hardness of cursors by dragging in Photoshop CS5 Help. 
• 3D Axis. See 3D Axis (Photoshop Extended) in Photoshop CS5 Help.
• 3D Lights. See 3D Lights settings (Photoshop Extended) in Photoshop CS5 Help.
• 3D acceleration

• Preview panel
• Full-screen preview
• Review mode

See Preview and compare images in Adobe Bridge CS5 Help for information on all of these features.

• Mode > Basic Uses the least amount of GPU memory and enables basic OpenGL features.
• Mode > Normal Uses more GPU memory and enables GPU-based color matching, tone mapping, and checkerboard blending.
• Mode > Advanced Provides the benefits of Normal mode as well as newer OpenGL advances that can result in improved performance.
  
  Note: On Mac OS, Advanced mode requires Mac OS 10.6.x. Advanced mode is not available in Mac OS X 10.5.x.
• Vertical Sync Reduces tearing by syncing the frame rate to that of the display.
• Anti-Alias Guides And Paths Allows the GPU hardware to smooth the edges of drawn guides and paths.

• OpenGL Uses hardware acceleration when interacting with 3D objects.
• Ray Tracer Offers slower performance but allows you to view shadows, reflections, and refractions when interacting with 3D objects.

• Vertical Sync Reduces tearing by syncing the frame rate to that of the display.
• 3D Interaction Acceleration Increases the clicking speed when working with 3D forms. If you experience drawing problems that correct themselves when you release the mouse button, turn off this option.
• Force Bilinear Interpolation Tells the GPU to perform high-precision modeling and smoothing functions when you use a card that doesn't support those functions.

• Use For Image Display Doubles the video RAM used to display the main image when you use multiple images, large images, or large 3D models. Available only on display cards that have at least 512 MB of RAM.
• Compositing > None Does not composite the image over the checkerboard (results in black over the translucent areas).
• Compositing > Linear Uses a linear blending approach to apply the checkerboard compositing.
• Compositing > Gamma Corrected Uses a perceptually correct approach to compositing the image over the checkerboard.
• Color Matching Can be used to avoid the display of visual artifacts.