Mask layers let you use a layer to mask the visible area of an image or other layers. They can be used in a variety of ways: experimenting with design effects; blending several elements together; helping fix repeat joins; and for manipulating Partial Images.

Using mask layers enables you to change the view of the original image or layer in real time, without altering them until you are ready to do so. The versatile nature of masks means you can save them within your file, undo them with your History Window or throw them in the bin.

• Open a design containing an image or layers and make a selection of the area you want to mask

• Select New Mask from the Layer Menu
• Use the disclosure triangle in the Layers Palette to reveal the mask layer

• Activate the mask layer in the Layers Palette by clicking in its pencil icon

A mask layer effectively acts as a window, only letting you see particular areas of the design. In this case, it is the area you selected at the start of the process.

• Solid areas on the mask layer will reveal the destination image or layer. Blank areas on the mask layer will completely mask out the information on the destination image or layer. Tonal areas on the mask layer will effectively show a soft, faded version of the destination image or layer.
• Edit the mask layer with drawing tools to create your desired effect

When you have finished editing the mask layer, simply click on the disclosure triangle again to hide the components for that image.

You can continue to build up this design by adding spot layers, or by using Partial Images from other designs.

Removing mask layers

Masks can be removed in two ways. It is important to choose the appropriate method for your requirements:

• Drag the actual mask block directly to the bin in the dock
• With only the mask layer active, click on the bin icon in the Layers Palette