8.55. Posterize
| 8. The “Colors” Menu |

### 8.55. Posterize

This tool is designed to intelligently weigh the pixel colors of the selection or active layer and reduce the number of colors while maintaining a semblance of the original image characteristics.

#### 8.55.1. Activating the Command

You can find this command through Colors → Posterize…

#### 8.55.2. Options

Figure 16.239. Posterize tool options

Posterize Levels

  Here, “level” means “number of colors per channel ”.

  This slider and the input boxes with arrow-heads allow you to set the number of levels (2-256) in each RGB channel that the tool will use to describe the active layer. The maximum total number of colors is the combination of these levels. A level to 3 will give 33 = 27 colors.

Preview

  The Preview checkbox enables the rendering of changes right on the canvas for immediate evaluation.

#### 8.55.3. Example

Original image. The Colorcube Analysis shows a great number of colors.

Original image posterized in 3 levels. The Colorcube Analysis shows 11 colors (less than the possible number 27).

8.54. Colorize |  | 8.56. Color to Alpha…

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