Defining the knockout shapeUse the Opacity & Mask Define Knockout Shape option to keep the knockout effect proportional to the object's opacity--in areas of the mask that are close to 100% opacity, the knockout effect will be strong; in areas with less opacity, the knockout effect will be weaker. For example, if you use a gradient mask as a knockout group, the underlying object will be knocked out progressively, as if it were being shaded by a gradient. You can create knockout shapes with both vector and raster images. Note: The Opacity & Mask Define Knockout Shape option is most useful for objects that use a blending mode other than Normal. ![]() Knocking out shapes using a gradient mask A. Original objects B. Multiply blending mode applied to circle C. Circle with gradient added D. Both circles targeted and Make Opacity Mask selected in Transparency palette menu E. Star and circles grouped, and Knockout Group option applied F. Opacity & Mask Define Knockout Shape option applied to circle ![]() Knocking out shapes using a raster image A. Guitar raster image with transparent pixels and Color Burn blending mode B. Ellipse and guitar grouped and Knockout Group option applied C. Opacity & Mask Define Knockout shape option applied to guitar To define a knockout shape:
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