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Notes:
•
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 transpar-
ent 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.
One of the most common and useful overlay key types is the Blue Screen.
The following procedure is a simple example of how to use a Blue Screen
effect in Video Editor. The primary factor in determining the success of a
Blue Screen effect is in the actual filming and not in post production. If you
have a good solid colored screen and uniform lighting, creating a Blue
Screen effect is easy. If you do not have either of these things, it is nearly
impossible to get a clean overlay.
MEDIASTUDIO PRO USER GUIDE
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