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Use transparency to shape a knockout
You can use 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. This technique is most
useful for objects that use a blending mode other than Normal.
- Do
one of the following:
To
use an opacity mask to shape the knockout, select the masked artwork,
and then group it with the objects you want to knock out.
To
use the alpha channel of a bitmap object to shape the knockout,
select a bitmap object that contains transparency, and then group
it with the objects you want to knock out.
- Select
the group.
- In
the Transparency panel, select Knockout Group until the option displays
a checkmark.
- Among
the grouped objects, target the masking objects or transparent image in
the Layers panel.
- In
the Transparency panel, select Opacity & Mask Define Knockout
Shape.
 Knocking out shapes using a bitmap object - A.
- Original artwork
- B.
- Darken
blending mode applied to the word “PEARS”, and Group option selected
- C.
- Opacity
& Mask Define Knockout shape option applied to word
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PDF (adobe.com)
