5.9. 色调分离

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.

5.9.1. Activating the Tool

You can get to this tool in several ways:

  • In the image menu through ToolsColor ToolsPosterize… or ColorsPosterize….

  • By clicking on the tool icon in Toolbox, if this tool has been installed there. For this, please refer to 第 1.7 节 “Toolbox”.

5.9.2. 选项

图 14.174. Posterize tool options

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.

预览

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

5.9.3. Example

图 14.175. Example for the Posterize tool

Example for the Posterize tool

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