Mostly this is a question for GamerPrinter, but I figured I'd post it rather than sending a PM since it's a question that probably comes up pretty frequently. I looked through the threads for one that already had the info, but couldn't find one.

Today I showed my Mom my random practice continent, and she fell in love and asked for a version of Middle Earth in that style for her wall.

However, when I tried printing the one I had a few days ago, it was way too dark (and too low-res) for a paper version.

If I'm making a map for the express purpose of printing and framing it, what dpi should I make it, and should I keep the colors a lot lighter or did my printer just suck?