5.8. Posterize

5.8. Posterize
	5. Color Tools

Revision History
Revision $Revision: 2562 $	2008-01-28	j.h

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. Activate 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 13.143. 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 13.144. Example for the “Posterize” tool

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