Paint Shop Pro Basics 36) Tools - Color Replacer Brush

Color Replacer is not quite the power house it sounds like. It's better for 2D solid color situations. Because it replaces, rather than adjusts, the color defined by the foreground color in the materials palette with the color defined by the background color.

It flattens things if used inappropriately, and there is a tolerance setting so you end up effecting more than just the single color. But it still has its uses.