8.54. 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.

8.54.1. Activating the Command

You can find this command through ColorsPosterize…

8.54.2. Options

图 16.246. Posterize tool options

Posterize tool options

Posterize Levels

Here, level means number of colors per channel .

This slider and the input boxes with arrowheads allow you to set the number of levels (2-256) in each RGB channel that the tool uses 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.


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

8.54.3. 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).