I would continue with dark panes. Changing to white would look odd.

what if the previous home owner painted half the trim white and half the old dark wood (looks black) should we paint the white trim black?

I just moved into a house where some of the trim was an off white color and some of the trim was a very dark chocolate brown. The rooms that had the darker trim were so dark, I had the trim painted the same off white color and the house looks more open and cleaner and brighter.
I love the look of the dark trim on the window, it is a very continuous line, as if the view is unobstructed, but again, it can be very dark.

I really like that idea: My husband and I just moved this a spanish style home in Toledo Ohio, and the previous owner left us with this trim, half original trim(very beat up) and half white. We just finished painting the valeted living room a nice spanish white and are going to continue it into the dining room, but do you think the white trim would look good extended into the living room? We are ideally replacing carpet with hardwood.

sorry for typos, typing too fast :)

I think your living room would lose a lot of its drama if you painted its trim white. The dark trim ties in beautifully with the fireplace.

And a thought about white trim in general: if your walls are also a white, you need to be sure that there is enough contrast between the two, and that the two work well together. Unless you paint the trim the same color as the walls, but I always think that's kind of boring!

Good luck with your wonderful new home!

This is perfect.

are the window casings painted or stained?

This is one of the most thoughtfully designed residences I have seen in a long time. The furnishings too, are impeccable and complement the architecture perfectly.