A matte painting is a background that is either 2D or 3D that is used for chroma key replacement.
What? It is a bunch of pictures all edited into a single photo using a photo editor. Such as Photoshop or Gimp.
What is chrome key? Chroma key is the proper way of saying, green screen or blue screen.
Let me give an example. Lets say that there is a scene in a movie that is being shot by the mountains. You have two options to shoot the scene.
1. Go find some mountains that suit you needs, or
2. Green screen the background out so you can insert a matte painting of your own mountains.
Here is two pictures that demonstrates what I mean...
That is the power of a matte painting! OK, so now you want to see mine, right.
Here it is!
In this picture I had about 75 layers of items. I was able to do this matte out of only 9 pictures. It is still far from perfect! My green on the vines is still to bright and the proportion of the pillars is not quite fitting to the buildings. But that is how you learn, right!
Have you ever attempted a matte painting?