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Chapter 3. Working with Preferences > Controlling Transparency & Gamut Preferen...

Controlling Transparency & Gamut Preferences

The Transparency & Gamut preferences control how Photoshop displays transparent areas of a document (commonly called the tablecloth), as well as the color and opacity of areas of an image that fall outside of the CMYK (Cyan, Magenta, Yellow, Black), color mode. It's important to understand that transparency in Photoshop does not always translate into transparency, after you save the file. For example, the JPEG format is used primarily for images saved for the Internet, and does not support transparency. When you save the file, Photoshop will fill the transparent areas of the image with a matte color (default white). In addition, the Gamut Warning mask is used because a monitor displaying color information using RGB, and has more saturation values than a 4-color press (CMYK). Using new inks and spot colors can sometimes overcome an out-of-gamut color. For transparency it's important to remember that unless you're printing the document directly in Photoshop, it's the format that determines if the transparent areas will be saved, and the Gamut Warning is there to warn you of any areas that may not be saved.

Control Transparency & Gamut Options

Click the Edit (Win) or Photoshop (Mac) menu, and then point to Preferences.

Click Transparency & Gamut.

Select the Transparency Settings options you want to use:

  • Grid Size. Allows you to select a transparency grid size.

  • Grid Colors. Allows you to choose the color scheme for the transparency grid.

  • Use Video Alpha. This option, when selected, lets you preview certain transparency settings. However, it requires hardware support.

Select the Gamut Warning options you want to use:

  • Color. Choose a color to mask areas of an image that move out of the CMYK color space.

  • Opacity. Enter a value from 0 to 100 percent.

    Opacity determines how much of the Color Overlay masks the original image pixels.

    For example, if you choose the color gray, and an opacity of 100 percent, areas of an image that fall outside of the CMYK color space will be masked with gray.

Click OK.

IMPORTANT To activate the gamut warning option, open a document in Photoshop, click the View menu, and then click Gamut Warning. Out of Gamut areas of the image will display with the color and opacity chosen in the Transparency & Gamut preferences.



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