Result is 1-A.  This is the complement of A. 
A may be a float, point or color. The result will be the same data type.
A should lie in the range [0,1].  Vectors should be normalized.

The value to be reversed.
This may be a float, point, or color.  The default is float.
Inputs should lie in the range [0,1].  Vector should be normalized.

Result is 1-A.  This is the complement of A. 
The result will be the same data type as A.
Output will be in the range [0,1].