Can the Color of Text Be Automatically Inverted Based on its Background?

[abajan]

Using GIMP, is there a (simple) way to have the color of text automatically invert whenever it's over a background of a similar color? For instance, I've seen print ads where black text on a white background becomes white wherever it's over a dark enough background that would make it difficult to read were its color not reversed, due to the lack of adequate contrast. In case I'm not explaining the issue clearly, this post pretty much illustrates the effect I want. But I don't need it for animation purposes, just static documents.

Thanks.