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14.8. ColorSync As you may have discovered through painful experience, computers aren't great with color.

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Nội dung Text: ColorSync

  1. 14.8. ColorSync As you may have discovered through painful experience, computers aren't great with color. Each device you use to create and print digital images "sees" color a little bit differently, which explains why the deep amber captured by your scanner may be rendered as chalky brown on your monitor, yet come out as a fiery orange on your Epson inkjet printer. Since every gadget defines and renders color in its own way, colors are often inconsistent as a print job moves from design to proof to press. ColorSync attempts to sort out this mess, serving as a translator between all the different pieces of hardware in your workflow. For this to work, each device (scanner, monitor, printer, digital camera, copier, proofer, and so on) has to be calibrated with a unique ColorSync profile—a file that tells your Mac exactly how it defines colors. Armed with the knowledge contained in the profiles, the ColorSync software can compensate for the various quirks of the different devices, and even the different kinds of paper they print on. Most of the people who lose sleep over color fidelity are those who do commercial color scanning and printing, where "off " colors are a big deal. After all, a customer might return a product after discovering, for example, that the actual product color doesn't match the photo on a company's Web site. 14.8.1. Getting ColorSync Profiles ColorSync profiles for many color printers, scanners, and monitors come built into Mac OS X. When you buy equipment or software from, say, Kodak, Agfa, or Pantone, you may get additional profiles. If your equipment didn't come with a ColorSync profile, visit Profile Central (, where hundreds of model-specific profiles are available for downloading. Put new profiles into the Library ColorSync Profiles folder. GEM IN THE ROUGH The Coolest Feature? Deep in the ColorSync Utility program beats one of the coolest Mac OS X features that no-body's ever discovered. On the Profiles tab, you can click the name of a color-device profile and view a lab plot of its gamut (the colors it's capable of displaying). What you might not realize, however, is that this is a 3-D graph; you can drag its corners to spin it in
  2. space. But that's not the cool part. The tiny triangle in the corner of the graph is a pop- up menu. If you choose "Hold for comparison" and then choose a different color profile, you'll see both lab plots superimposed, revealing the spectrum areas where they overlap—and the yawning gaps where they can't display the same colors. You'll find out, among other things, that some printers can't display nearly as many colors as your monitor can, and that inkjets are much better at depicting, say, cyan than green. And while we're discussing features you might have missed: You can double- click a profile's name to view a dizzyingly complex scientific description of its elements. Blue colorant tristimulus, anyone? 14.8.2. Default Profiles In professional graphics work, a ColorSync profile is often embedded right in a photo, making all this color management automatic. Using the ColorSync Utility program (in Applications Utilities), you can specify which ColorSync profile each of your gadgets should use. Click the Devices button, open the category for your device (scanner, camera, display, printer, or proofer), click the model you have, and use the Current Profile pop-up menu to assign a profile to it. Tip: In the Displays pane of System Preferences, you'll find a Color tab. Its Calibrate button is designed to create a profile for your particular monitor in your particular office lighting—all you have to do is answer a few fun questions onscreen and drag a few sliders. 14.8.3. More on ColorSync
  3. If you ache to learn more about ColorSync, you won't find much in Mac OS X's Help system. Instead, search the Web. At, for example, you'll find articles, tutorials, and links. Going to a site like and searching for ColorSync is also a fruitful exercise.  


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