Once you start noticing the tinge of orange and blue, you will find a pattern that is spread through the landscape of modern day film making. Colour is extremely important for the visual medium; it sets the mood, sticks people out and tells a story. When you pay close attention you will come to realise that each poster, trailer and full length feature film has nuances of exaggerated colour schemes that is preferred by the person telling the story. If you do want to dig into this further, here is a great infographic that spells it out. But there are other blog out there that offer an in-depth explanation.