You can also perform the same operation as post-work gamma correction.

Here's the setup.

Of course, you really should anti-gamma correct all your incoming colors to get this to work really well. Otherwise, it may look washed out.

If you're not going to anti-gamma correct all your incoming material, you can try decreasing the amount of gamma correction. I used 2.2 here in the Math:Div node - try lower numbers like 1.5.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)