Since a lot of people are still wondering what a matte painter really does in a studio, I put up an overview of most basic tasks you would undertake as Junior Matte Painter: cleaning, extending, light enhancement and grading.
This article is very simple and intended for the students and guys who want to begin on this path, so everyone else please don't take offence
I hope that in the future I will be able to put up some more advanced aspects such as architecture match up and camera projection
Anyway, here's the link
Let me know if it's of any use!