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Chapter 5. Graphics on Multiple Layers > Working with Mask Layers

Working with Mask Layers

Mask layers are special layers that allow you to hide and show elements on underlying layers.

To create a mask layer:

1.
Do one of the following:

  • To create a new layer, in the Timeline, click the Add Layer button. Flash selects the new layer.

  • Select a layer that already exists.

In general, you should create (or select) a layer directly above the layer containing content you want to mask, although you can always create the mask separately and link the masked layers to it later.

2.
From the Modify menu, choose Layer to display the Layer Properties dialog box.

3.
In the Type section, click Mask (Figure 5.19).

Figure 5.19. Select Mask as the layer type in the Layer Properties dialog box to define a layer as a mask.


You can also rename the layer to identify it as a mask, if you want.

4.
Click OK.

Flash turns the selected layer into a mask layer and places a little down-arrow icon before the layer name, indicating that the layer will affect linked layers below it (Figure 5.20).

Figure 5.20. The mask-layer icon.



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