This is probably something that you would be better off taking to a paint store.
Last summer, I did a house that was similar to what you discribe. Ths shutters and door were done with a color that I can only discribe as a brownish cranberry. Looks sharp!
I made the paint by starting with Ben Moore's Cottage Red, I added some black paint to it and then added just enough green pigment to knock the purple color into the brown family.
A little complicated for the average homeowner. Best go to the store and get some color chips and see what looks best.
Hope that helps!
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