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4.10. Menu sub-picture mask, color and highlight
Each PGC has a color palette of 16 colors which can be used to highlight certain interactions with the display menu. The display menu, whether it is a still picture or a motion video, is contained in one of the cells of this PGC. Each color in the palette is a 24-bit entity. There are four types of interactions which define how the colors are displayed on a menu: display, selection, action, and subtitle. Each of these types of interaction requires a group of four colors (background, foreground, inner edge, and outer edge), hence a total of 16 colors in a PGC color palette.

The background color is abbreviated as Bg and is used to display a background. In simple black-and-white masks, the background color covers the white area of the mask layer. The foreground color is abbreviated as P (Pattern) and is used to display the primary patterns of the mask. In simple black-and-white masks, the foreground color covers the black patterns of the mask layer. Similarly, the inner edge color and the outer edge color are abbreviated as E1 (Emphasis 1) and E2 (Emphasis 2), respectively. Each color has an associated transparency level. 100%-transparency is opaque.

When a menu is displayed (by pressing the Menu key on the remote control or by being linked to by a navigation command), the type of interaction is "display". The remaining contents of this page are available from the Acrobat PDF ebook. The following screen shot shows the page taken from the ebook.



When a button is selected by pressing the up, down, left, right keys on the remote control or by navigation commands, the portion of the mask layer enclosed by the highlight area of the button is displayed. This type of interaction is "selection". More information are available from the pages of Acrobat PDF ebook. The following screen shot shows the page taken from the ebook.



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