I don't have time to write out the source, but I can suggest a possible 
solution if you are looking for a quick answer.  Use your image map as a 
pigment function, and then you should be able to directly multiply the 
output of the function by whatever scalar you want.  The function and 
its multiplied scalar can then be declared as a new pigment function. 
Hopefully one of the pros can help get you setup with this approach if 
you have any trouble.

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