5.8. Posterize
| 5. Color Tools |

### 5.8. 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.

#### 5.8.1. Activating the Tool

You can find this tool from the image-menu through: Tools → Color Tools → Posterize or Colors → Posterize,

or by clicking the icon in ToolBox, if Color Tools have been added to it.

#### 5.8.2. Options

Figure 13.153. Posterize tool options

Posterize Levels

  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 total number of colors is the combination of these levels. A level to 3 will give 23 = 8 colors.

Preview

  The Preview check-box makes all changes dynamically so that they can be viewed straight away.

#### 5.8.3. Example

Figure 13.154. Example for the “Posterize” tool

Image posterized in 4 levels. The histogram shows the 4 levels and 10 colors, counting black and white also.

5.7. Curves |  | 5.9. Desaturate