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11 Blend/Opacity controls how much of the overlay clip blends with the underlying
clip.
12 Transparency specifies how faded the overlaying clip appears.
13 Similarity specifies the range of key colors, relative to the selected one, to be
transparent.
14 Soft edge softens the transition's edges.
• If you select Color Key from the Type list, you have two options in choosing
a key color. You can click on the color box to choose the color to be
transparent using the Ulead Color Picker (you can also right-click the box to
choose from the Windows Color Picker) or you can click on a color in the
Overlay clip with the Eyedropper tool. The latter method is probably the
easier.
• In the Preview as list, you have three options. The Result option shows
you the applied overlay. The FG Only option displays just the overlay clip
with the underlying clip replaced by a solid color. The Mask option displays
the transparent areas of the overlay in white and the opaque areas in black.
(The foreground clip is sometimes referred to as the Mask.)
• Adjust the Similarity slider a higher percentage to set more colors to be
made transparent.
• Opacity works with all types except Alpha Channel, Gray Key and Blue
Screen.
Overlay key types
When you create an overlay effect, the Overlay Options dialog box allows you to
select from a number of overlay types in the Type list. There are two main types
you can choose from: color-based and mixed-based. Color-based types, such
as Color, Luma, Chroma, Gray Key and Blue Screen, all work by making a
specified key color transparent. (These types also allow you to control the
Similarity and Transparency of the effect.) Mixed-based types, such as Multiply,
Add, Subtract, and Difference, determine how the overlaying and underlying clips
merge with each other by comparing the color value differences between each clip.
(These types only allow you to control the Opacity of the effect.) Mixed-based
types can also be easily identified as they work on the entire clip and you cannot
specify a key color in the Overlay clip of the preview window. This is a rather
complicated topic: please see the Help for more specific information about each of
these types of keys.
CHAPTER 4: ADDING EFFECTS AND TITLES 111
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