# Post-processing system
Post-processing is generally used to finalize the screen space of the rendered picture, such as bloom (Bloom), depth of field (DOF), tone mapping (Tone Mapping), etc.
In the design of the small game framework, post-processing is actually a special type of rendering node (RGNode), whether it is built-in or developer-defined post-processing effects are completed by customizing the post-processing rendering node. But now that the editing function of the rendering system is not perfect, and in order to provide developers with the ability to use some uncomplicated post-processing effects more conveniently, the small game framework also provides post-processing resources to simplify the use process.