MACROMEDIA FIREWORKS MX 2004-USING FIREWORKS Use Manual page 149

Changing the way masks are applied
You can use the Property inspector to ensure that you are editing a mask and to identify the type
of mask you are working on. When a mask is selected, the Property inspector lets you change the
way the mask is applied. If the Property inspector is minimized, click the expander arrow to see all
properties.
Vector masks are applied using their path outline by default. The outline of the path or text is
used as the mask. Optionally, you can show the mask's fill and stroke. This produces the same
result as using Paste Inside to create masks. For more information, see "Creating a mask from an
existing object" on page 137.
A vector mask applied using its path outline with Show Fill and Stroke enabled
By applying a bitmap mask using its alpha channel, you can create a mask that looks similar to a
vector mask applied using its path outline. When you apply a mask using its alpha channel, the
transparency of the mask object affects the visibility of the object being masked.
A bitmap mask applied using its alpha channel
Masking images 149