Adjust > Mean
find the average color of an image or selection. It then fills the image or selection with this color to create a smooth look.
1. Choose Adjust > Mean
2. Use the following options:
  Radius (px)
Determines the number of pixels surrounding the pixel that affect the blurring. The greater the value, the more obvious the blurring.

Min = 1, Max = 100, Default = 1.
Using Preview Windows
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Related Information
Effects > Frame > Meander
Effects > Tessellation > Meander
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