Adobe illustrator 10 Manuale Utente
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Adobe Illustrator Help
Using Transparency, Gradients, and Patterns
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3 In the Transparency palette, select Knockout Group to turn it on (check mark).
To prevent objects from knocking out within a knockout group or layer:
1 Select the group using the selection tool, or target it in the Layers palette.
2 Choose Show Options from the Transparency palette menu, if necessary.
3 In the Transparency palette, deselect Knockout Group to turn it off (no mark).
Defining the knockout shape
Use 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.
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.
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
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
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:
1 Group the objects you want to knockout.
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