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Chapter 9. Masking > What Are Masks?

What Are Masks?

Masks are objects that change the shape and/or opacity of other objects. Simply put, masks are a way to selectively show and hide content. Here’s an analogy: Masking is like holding a card with holes in it in front of my face. When you look at me, you might see an eye and my lips, but the card masks my nose and middle of my face. If I move the card up a little, you can see my nose but not my eyes. In this simple example, the card acts as a mask that allows only certain parts of my face to be visible.

Both vector and bitmap objects can be used as the mask object. The mask object is the one doing the masking. The masked object is the object that is being masked. Therefore, you have the mask and the “maskee.”


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