Invert button for maps

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Invert button for maps

I wish for a button which allows me to use bumpmaps/transparancy maps that are made with inverted colors (black/white vs. white/black, and viceversa). I get alot of bump and transparency maps from the internet that use another method of determining the height and transparency of a material. I know 3dsmax has this option and it's very handy. I noticed that Cheetah uses black for heigher bump and others use white for height. Same idea for transparency. Is there a reason for this? I know I can invert the maps using an image editor, but this would be much easier and faster!
Thanks!

Regards,

Peter
 
You can invert the Displacement modifier or bump maps by setting the offset/bump intensity to a negative value. Unfortunately it doesn't seem to work for transparency maps or relief objects.
 
OK thanks for the bump solution (unbelievable I didn't check that one :) )
Still leaves the transparency mapping.

Regards,

Peter
 
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