### 11.8. Simple Linear Iterative Clustering (SLIC)

#### 11.8.1. Overview

This filter creates superpixels based on k-means clustering.

Superpixels are small cluster of pixels that share similar properties. Superpixels simplifies images with a great number of pixels making them more easy to be treated in many domains (computer vision, pattern recognition and machine intelligence). GIMP's aim is more humble: create a posterization effect.

k-means clustering is one of the most used algorithms to create superpixels. Superpixel color is the mean of pixels color in the corresponding region.

#### 11.8.2. Activating the Filter

This filter is found in the main menu under Filters → Artistic → Simple Linear Iterative Clustering….

#### 11.8.3. Options

Figure 17.223. “Simple Linear Iterative Clustering” options

Presets, “Input Type”, Clipping, Blending Options, Preview, Merge filter, Split view

  | Note
  These options are described in Section 2, “Common Features”.

Regions size

  Increasing regions size collects more pixels, and so superpixels size increases also.

  Figure 17.224. “Regions size” example

  Regions size = 16

  Regions size = 32

Compactness

  Superpixels borders may be irregular. Increasing this option gives superpixels more regular border.

  Figure 17.225. “Compactness” example

  Compactness = 20

  Compactness = 40: look at the dome.

Iterations

  How many times filter is repeated. Increasing this value gives more details.

  Figure 17.226. “Regions size” example

  Iterations = 1 (default)

  Iterations = 15

11.7. Photocopy |  | 11.9. Softglow

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