Normal Strength Node
Access: Nodes > Filter > Normal Strength
The Normal Strength node adjusts the strength of the input tangent space normal map by blending it towards or away from a flat normal. The higher the strength, the further the input normal points from a flat surface and the more extreme the resulting normal map becomes.
This node can be used to make adjustments to a normal map without having to make any changes to the map itself. It is a good way of iterating and comparing various strengths.
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                                                                     Normal Strength with a value of 0.5.  | 
                                                                
                                                                     Normal Strength with a value of 6.  | 
                                                            
Normal Strength Node Inputs
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                                                                     Input  | 
                                                                
                                                                     Description  | 
                                                            
| 
                                                                     Input  | 
                                                                
                                                                     The normal map to input.  | 
                                                            
Normal Strength Node Outputs
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                                                                     Output  | 
                                                                
                                                                     Description  | 
                                                            
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                                                                     Output  | 
                                                                
                                                                     The normal map that is output after the strength has been adjusted.  | 
                                                            
Normal Strength Node Properties
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                                                                     Strength text field, slider  | 
                                                                
                                                                     The strength of the normal map. A value of 0 outputs a flat normal, value of 1 outputs the same normal as was input. 
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