Here's the same area but with the bump turned off. See the burned-in speculars - the little white spots? Those become big ugly bumps when you try to use this as a bump map.

Someone suggested using a high-pass filter to make a bump map from the specular map. WRONG! A high-pass filter would just accentuate these small spots, instead of removing them.

But remember, these burned-in speculars are a problem even if you do not make your bump map from the color map. They should not be there under any circumstances.

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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)