MACROMEDIA FIREWORKS MX 2004-USING FIREWORKS Use Manual page 143

Do one of the following to create the mask:
3
Choose Modify > Mask > Reveal Selection to show the area defined by the pixel selection.
Choose Modify > Mask > Hide Selection to hide the area defined by the pixel selection.
The results of Reveal Selection and Hide Selection
A bitmap mask is applied using the pixel selection. You can further edit the mask to reveal
or hide the remaining pixels of the masked object using the bitmap tools in the Tools panel.
For more information about modifying a bitmap mask's appearance by drawing on it, see
"Modifying a mask's appearance" on page
About importing and exporting Photoshop layer masks
In Photoshop, you can mask images using layer masks or grouped layers. Fireworks lets you
successfully import images that employ layer masks without losing the ability to edit them. Layer
masks are imported as bitmap masks.
Fireworks masks can also be exported to Photoshop. They are converted into Photoshop layer
masks. If the masked objects include text and you want to maintain text editability in Photoshop,
you must choose Maintain Editability over Appearance when exporting.
Note: If text is used as the mask object, it is converted to a bitmap and is no longer editable as text
after it is imported into Photoshop.
Grouping objects to form a mask
You can group two or more objects to create a mask. The topmost object becomes the
mask object.
You can group objects as either bitmap masks or vector masks. The stacking order determines the
type of mask applied. If the top object is a vector object, the result is a vector mask. If the top
object is a bitmap object, the result is a bitmap mask.
Note: For more information about vector and bitmap masks, see
148.
"About masks" on page 134.
Masking images 143