Thanks so much, that's what was causing it! I only have 1 layer, but at some point I must have changed its opacity to 87% for some reason. Don't even remember doing it.

I'm using Inkscape to make graphics for an iOS game I'm developing. Various things that overlap, like menus and buttons, are slightly see-through in my game. This is strange because they look solid within Inkscape when I drag them over other images. I'm exporting them as PNG using the export area: s...