Is it possible to invert normal maps in cycles I have a normal map which is 'looking in a wrong direction' and I would like to get exactly opposite effect that this map gives in my Cycles render. Is it possible?
Bump map

For a bump map you can just drop in a invert node between the bump image and the bump node.



Normal map

For a normal map you can separate the RGB color channels and invert just the red and the green channels. Like in the image below.
click image for full size