GEOS SDK TechDocs|
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11 Windowing and Clipping | 
11.2 Clipping Each window has a color palette associated with it. For more information about manipulating palettes, see the Drawing Shapes chapter. The system will use the palette of whatever window is active. As a result, if two windows have different palettes, when one window is active, the other's colors will be distorted.
GEOS SDK TechDocs|
| 11 Windowing and Clipping | 11.2 Clipping