I echo porkchop above. Its a very nice room, just the way it is, please do not take all its character away from it.

You can leave the walls as is, but you might want to consider larger windows and light fabrics on the furnishings.

Another option is to have your wood blasted with walnut shells to make the wood appear lighter.

I agree with others, why would you want to do that.
I would change out all art on the walls to art that is larger and has a much lighter background. Love the black leather sofa, but would use a large lighter area rug. Think lighter accessories

It's call white wash--easily googled. When you said log I fully expected to see round logs inside your home, which had me thinking what has already been said.

This is my white washed summer house. it was done in 2006 and it has keept its light color ever since. It has not yellowed at all.

The flooring of corse is laminate.

I think the dark furniture doesn’t work well in that room. I’d consider new furniture before touching the walls.

Why? The wood is the best in show.

These photos illustrate a 'whitewash' finish on the wood. It's not full coverage. I don't think this can be accomplished with paint. It's easier to achieve with a transparent stain.

Your room is much more attractive than the white washed dull boring rooms, in the above pictures. I would leave it alone and maybe replace some of the furniture.