I just saw this excellent tutorial to reduce the noise:
and my brain has been exhausted and burned. I definitely not yet able to understand that.
So what I need is to apply Blur only to an object or material (on a scene with many different objects).
In Cycles, Is there a simple way to apply filters by objects or materials?. Or better the question related to what I saw in that video:
Is it possible to choose as “Determinator” an object or material in the Bilateral Blur node?
Without knowing much about it, I guess the problem is that it is not possible to determine exactly what will be the edges/limits of each object in the resulting image of the render. But ask this in case someone knows a easier way to do this that I want.
I just found this about “Render Layers”:
I guess this solves my problem about to be able to apply filters only to an object of the whole scene, right?