Here I increased the factor to 2.0 instead of 1.0.

So the grain of the wood is enhanced. But the overall color remains the same because I added back what I subtracted - same color.

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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)