Adobe Fireworks CS3 Manuale Utente
ADOBE FIREWORKS CS3
User Guide
166
Bitmap mask properties in the Property inspector when a bitmap tool is selected
By default, most bitmap masks are applied using their grayscale appearance, but you can also apply them using their
alpha channel. For more information, see “Changing the way masks are applied” on page 176.
alpha channel. For more information, see “Changing the way masks are applied” on page 176.
Creating a mask from an existing object
You can create a mask from an existing object. When used as a mask, a vector object’s path outline can be used to
clip or crop other objects. When a bitmap object is used as a mask, either the brightness of its pixels or its trans-
parency affects the visibility of other objects.
clip or crop other objects. When a bitmap object is used as a mask, either the brightness of its pixels or its trans-
parency affects the visibility of other objects.
Masking objects using the Paste as Mask command
Using the Paste as Mask command, you can create masks by masking an object or group of objects with another
object. Paste as Mask creates either a vector mask or a bitmap mask. When you use a vector object as the mask, Paste
as Mask creates a vector mask that crops or clips masked objects using the path outline of the vector object. When
you use a bitmap image as the mask, Paste as Mask creates a bitmap mask that affects the visibility of masked objects
using the grayscale color values of the bitmap object.
object. Paste as Mask creates either a vector mask or a bitmap mask. When you use a vector object as the mask, Paste
as Mask creates a vector mask that crops or clips masked objects using the path outline of the vector object. When
you use a bitmap image as the mask, Paste as Mask creates a bitmap mask that affects the visibility of masked objects
using the grayscale color values of the bitmap object.
To create a mask with the Paste as Mask command:
1
Select the object you want to use as the mask. Shift-click to select multiple objects.
Note: If you use multiple objects as the mask, Fireworks always creates a vector mask, even if both objects are bitmaps.
2
Position the selection so that it overlaps the object or group of objects to be masked.
The object or objects you want to use as the mask can be either in front of or behind the objects or group to be
masked.
masked.
3
Select Edit > Cut to cut the object or objects you want to use as the mask.
4
Select the object or group you want to mask.