Is there a technique that can allow for masked tinting of a layer?

I have an overhead map of a keep set in the forest. I'd like to tint only exterior portions of the map a dark blue (night) but retain the original look of the interior of the keep (since it is warm and dry). I can add rain and other FX and use the mask to restrict those FX to the exterior but I cannot seem to find a way to add tinting to the FX layer (visible areas or otherwise). And when I add tinting to the base map, it seems to be an all-or-nothing operation, without the ability to use masking. Am I missing some key functionality that exists? Or in lieu of that, is there some kind of technique to arrive my desired result?

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Originally Posted by DeDiceManCometh

I have an overhead map of a keep set in the forest. I'd like to tint only exterior portions of the map a dark blue (night) but retain the original look of the interior of the keep (since it is warm and dry). I can add rain and other FX and use the mask to restrict those FX to the exterior but I cannot seem to find a way to add tinting to the FX layer (visible areas or otherwise). And when I add tinting to the base map, it seems to be an all-or-nothing operation, without the ability to use masking. Am I missing some key functionality that exists? Or in lieu of that, is there some kind of technique to arrive my desired result?

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Yes, see the Ambient lighting section of this article.

Also video 18 here.

You could try using an Adjust Colors FX layer.