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Figure 5.24 Gemstar-TV Guide’s GUIDE Plus+ Interface Design<br />

Principle: Enhancements should not compete with the main content<br />

Enhanced elements should not compete with the primary elements on the screen,<br />

which should be viewed as a whole. The purpose of enhanced content is not to dominate<br />

the interaction process, but rather to present a thematic and visual framework that the<br />

user can understand in order to integrate the additional information.<br />

Textual enhancements and stills should not compete with the moving image in the<br />

primary portion of the video screen. Figure 5.25, an example from PBS’ Life 360,<br />

illustrates the visual confusion that arises when competing elements appear on the screen.<br />

The enhancement layer on the left featuring the solider in the background directly<br />

competes with the image of the solider in the main video display. Because our eyes move<br />

across the screen from left to right, our attention focuses first on the figure in the<br />

enhancement rather than the main character in the program. In cases such as this, it is<br />

difficult for users to know which area to direct attention to.<br />

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