Apple DVD Studio Pro 4 - Manual (Page 104)

If you also wanted a checkmark to appear next to each text button as it was selected, but
you wanted the checkmarks to be yellow when they were selected, you’d need to add
the checkmarks to the overlay graphic and set them to be a different overlay color than
the text (in this case, dark gray) so that you could apply a different highlight color (in this
case, yellow).
In the same way, you could add the word “OK!” after each text button and show it only
when the button was activated. Simply add the text to the overlay and set it to be black;
in DVD Studio Pro, you can set black to be transparent for the normal and selected states
but visible with a green color in the activated state.
Play Movie OK!
Light gray
checkmark
Dark gray
name
Black
“OK!”
White
background
To create an advanced overlay
1 Create a full-screen white background. See Square Pixels in Graphics for information on
the frame size to use.
Note: You don’t have to use white as the background color, as you do with simple overlays,
but it is a good idea to use white, because the default color mapping settings assume it
is the background.
2 Depending on whether you intend to use the chroma or grayscale method, add elements
using the three leftover overlay colors (white having been used for the background).
3 Depending on the graphics application you use, you may need to flatten the overlay
elements into a single layer.
If you use colors other than the four that are specified by the method you chose (chroma
or grayscale), they are mapped to their closest equivalent when you use the overlay. In
many cases, this produces surprising (but not useful) results.
Note: Following is the mapping used for each overlay color with the grayscale method:
100% to 80% is white, 79% to 58% is light gray, 57% to 32% is dark gray, and 31% to 0%
is black.
104 Chapter 6 Preparing Menu Assets