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Chapter 3. Customizing the Way You Work > Controlling Transparency & Gamut Pref...

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.


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