Compositing is the process of combining various sources of visual information into a single, finished image. The Nodes Editor window in Blender provides access to a very advanced and powerful compositing engine.
Regardless of the type of input you provide, the Compositor processes one image at a time. To process your image, you use nodes to import it into Blender, modify it, blend it with other photos if desired, and then save it.
The first option is to pre-define the output in the render>output properties panel. You can choose a file type and a destination there. The image will automatically save after you click render.
Blender is primarily a 3D programme that is best suited for modelling, animation, and rendering. It does, however, come with a fantastic built-in compositor (for editing the final result, sometimes called post-processing).
Compositing is the art of merging visual elements from various sources into a single image, usually to give the impression that they are all part of the same scene. Live-action compositing is referred to as "chroma key," "blue screen," "green screen," and other terms.
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