Types of Onscreen Controls
Several onscreen controls, such as Center, are common to many filters. However, some
filters have unique onscreen controls. The following list provides examples of the types
of controls available. If you’re unsure of an onscreen control’s function, drag it in the
Canvas while viewing the Filters Inspector to see which parameter changes.
• Center: This is the most common filter onscreen control. Drag in the center of the circle
to reposition the filter’s Center parameter.
Light Rays filter Center onscreen control
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• Amount: This onscreen control has different representations, depending on the filter.
In the Zoom Blur filter, drag the small circular handle (above the Center onscreen
control) to adjust the Amount parameter.
Zoom Blur filter Amount onscreen control
In the Prism filter, drag the arrow handle inward or outward to adjust the Amount
parameter. (Dragging the arrow in an arc adjusts the Angle parameter.)
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• Angle: This onscreen control also has different representations, depending on the filter.
In the Page Curl Filter, drag the circular middle handle to adjust the Angle parameter.
Kaleidotile filter Angle onscreen control
In the Kaleidotile filter, drag a corner handle to adjust the Angle parameter.
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• Rotate/Rotation/Twirl: This onscreen control has different representations. In the Page
Curl Filter, drag the outer arrow handle to adjust the Rotation parameter. In the Scrape,
Stripes, and Target filters, drag the small outer handle to adjust the Rotation parameter.
Scrape filter Rotation onscreen control
In the Twirl filter, the small outer handle adjusts the Twirl parameter.
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• Radius/Thickness/Size/Falloff: This onscreen control has different representations. In the
Disc Warp and Circle Blur filters, drag the large ring inward and outward to adjust the
Radius parameter. In the Droplet and Ring Lens filters, drag the inner ring to adjust the
Radius and Thickness parameters simultaneously. Drag in the area between the inner
and outer rings to adjust the Radius parameter. Drag the outer ring to adjust the
Thickness parameter.
Ring Lens filter Thickness onscreen control
In the Vignette filter, drag the inner ring to adjust the Size parameter. Drag the outer
ring to adjust the Falloff parameter. Drag in the area between the inner and outer ring
to adjust both parameters simultaneously.
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• Segment Angle/Offset Angle: This onscreen control has multiple representations. In the
Kaleidoscope filter, drag the outer handle to adjust the Segment Angle parameter.
Drag the middle handle (between the center and outer handle) to adjust the Offset
Angle parameter.
Kaleidoscope filter Offset Angle onscreen control