MACROMEDIA FIREWORKS 2, Руководство пользователя

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Creating and Editing a Graphic 83
Masking
In Fireworks, masks are created by grouping two objects
together as a mask group. The top object acts as the
mask, while the bottom object is the image to be masked.
Create masks from any element in Fireworks, including
images, path objects, or text. A mask group has two
primary uses:
◆
Pasting an object inside another object, so that the
top object continues to be visible. This is known as a
paste inside or clipping path in FreeHand. It crops
an image to its shape.
◆
Pasting an object inside another object, so that the
top object is not visible and the alpha of each pixel in
the top object becomes part of the mask or filter of
the bottom object. This is known as a layer mask in
Photoshop. A typical application of a mask is to use
the top image to define gradient transparency for
the bottom object.
Image and clipping path
Paste inside
Mask group