Simplify is a very versatile effect that may be used for both pre-processing of RGB or RGBa images intended for vectorization as well as for purely artistic effects.

Level |
Increase to apply more effect (that is, greater simplification). |

Neighbors |
The number of neighboring pixels to consider for each pixel. |

Times |
The number of iterations. |

Preview |
Check to see effect in action. |

Simplify works by taking each pixel in the image and examining its neighboring pixels out to a given number. The pixel is then set to a color given by the weighted average of its neighbors. Increasing the Times value tells Manifold to repeat the process the given number of iterations. Repeating this process will eventually reach a point where for any given combination of Level and Neighbors settings there will be a Times setting after which no more changes occur.

When applied to the sample bronze image with a high Level will result in a pointillist effect.

Applied with a maximum Level the figure becomes abstract in its simplification.

A Cartographic Example

We can use the Threshold command to pull features of a given color out of a scanned raster map, such as the above section of a USGS DRG scanned raster map.

Simplify applied with a Neighbors value of 3 gets rid of the scattered dots in the image.