The clear image attribute indicates whether the image buffer of the drawable associated with the renderer is cleared to the renderer's background color during renderer initialization. If you set clear image to True, then the image buffer is cleared; otherwise, the image buffer is not cleared. Only pixels within the renderer's clip list are modified during the clear.
The complete list of renderer attributes is listed in the Renderer Attributes Table.
For an overview about Renderers, see General Information. For a list of all Renderer functions and related topics, see Rendering.