Why do you want to use a green screen for film special effects synthesis?

Generally speaking, we call this method "green screen technology", which is often more effective in making special effects and technical compensation. We know that colorful colors have characteristics, and there is a certain collection quality ratio between colors, including light. When applied to green, it is easy to form the physical and size characteristics of the image. For cameras, the green screen is easier to saturate, track and locate, and see through. For production, the green screen has more imaging effect and color separation function. At present, mainstream special effects production does not necessarily rely on green screen technology like Avatar, and green screen technology is more suitable for making 3D movies. Movies like Transformers and Sparta 300 Warriors do not rely on green screen technology, and the effect is good.