Kudos

As the final look of the frame is achieved during the compositing stage, there will always be numerous occasions where there is a requirement for more render passes to finalize the image. This results in extra 3D renders, along with more time and money. Also, few inevitable applications that give life to an image, such as lens effects (Defocus, Glares, and motions blur), are render intensive. Blender Compositor provides alternate procedures for these effects, without having to go back to 3D renders. A well planned CG pipeline can always provide sufficient data to be able to use these techniques during the compositing stage.