Masks are created by grouping two objects together as a mask group. The top object (the mask) is used to create a cut-out effect on the bottom object.
You can use either an image or an object with paths as the top mask object.
A mask group has two primary uses:
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The path of a vector object outlines another object or image. This is known as a paste inside or clipping path in FreeHand. It shapes the underlying object or image to its path. |
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An image object's pixels outline other objects so that the top object is not visible and the value of each pixel in the top object affects the visibility of the bottom object. This is known as a layer mask in Photoshop. A typical application of a mask is to use the top image to define gradient transparency for the bottom object. |
By editing the stroke and fill attributes of the mask object, you can create many unique effects. See Editing mask groups for information on editing a mask object.
Image and clipping path
Path mask
Image mask