learning pre-comp

I would like to learn color grade, and trying to figure out if digital painting image textures is the same as painting textures in Blender. anyway. I can;t seem to find a tutorial on how color grade is done in say sentel of kajimba? is there a breakdown of kajimba so i can learn how they did the lighting, textures and pre-comp. also this Harry potter page, I understand the camera but, textures i am confussed. I am sure theu used digital painting of some image textures and matte painting but, I would like to know more about image textures to get a good look

http://blog.vincentlaforet.com/2012/12/19/the-hobbit-an-unexpected-masterclass-in-why-hfr-fails-and-a-reaffirmation-of-what-makes-cinema-magical/

here is a blender video showing the pre-comp but, I cant find the tutorials on this

pic down below, type of look I want, do I add a bloom effect and color grade?

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