Using transparency to shape a knockoutUse the Opacity & Mask Define Knockout Shape option to make a 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-masked object as a knockout, 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 objects. 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. Rectangle and wave made into an opacity mask C. Opacity mask and lighthouse grouped and then Knockout Group option selected D. Opacity mask targeted and Opacity & Mask Define Knockout Shape option selected ![]() Knocking out shapes using a bitmap object A. Lighthouse with transparent background B. Darken blending mode applied to lighthouse C. Lighthouse and moon grouped and Knockout Group option selected D. Opacity & Mask Define Knockout shape option applied to lighthouse To create a shaped knockout:
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