If you notice the sliver of wall on the left of the photo, you will see that the walls themselves, including above the trim, are a slightly warmer white than the trim. The paneling that you see in the photo is the same color as the trim.

Would you be willing to share paint colors so I may study?

I live this home! It is one of my absolute favorites on Houzz.

We do not post specifics on paint colors or manufacturers. These decisions are based on the aesthetic of the client, our goals for the room, and such ephemeral influences as the way the light fills the room.

Thank you for responding.

I've been trying to recreate this for a long time! Thank you so much for taking the time I remember and respond!