Square Root Node
Access: Nodes > Math > Square Root
The Square Root node outputs the square root of the input. Using the Square Root node is a quick method to obtain a gain effect on your textures to lift and lighten the base color values.
Input (RGBA)  Calculation  Output (RGBA) 
1.0, 1.0, 1.0, 1.0  √1.0, √1.0, √1.0, 1.0  1.0, 1.0, 1.0, 1.0 
0.5, 0.5, 0.5, 1.0  √0.5, √0.5, √0.5, 1.0  0.716, 0.716, 0.716, 1.0 
0.0, 0.0, 1.0, 1.0  √0.0, √0.0, √1.0, 1.0  0.0, 0.0, 1.0, 1.0 
Note: Alpha components retain their original value even if they are included in the calculation.
Square Root Node Inputs
Input 
The RGBA components of a vector input. 
Square Root Node Outputs
Output 
The square root of the input components which are selected in the Node Properties. Note: If any RGBA components are unchecked in the Node Properties, they pass through to the output unchanged. 
Square Root Node Properties
R checkbox 
When checked, the red component float value of the input is squarerooted and the result is output as the red component.


G checkbox 
When checked, the green component float value of the input is squarerooted and the result is output as the green component.


B checkbox 
When checked, the blue component float value of the input is squarerooted and the result is output as the blue component.


A checkbox 
This is checked off by default. The alpha component is passed through to the output as its original value. For example, an input alpha value of 1.0 is output as 1.0. 
Square Root Node Workflow Example
Using the Square Root node in the Node Graph allows you to get the square root of floating point color values, which lightens the selected RGBA components. In the example, a Tiled node with an image is fed into a Square Root node to lighten the tiled image.


If you are familiar with the Grade node, the Gain property of that node works in a similar way and gives you more overall control. However, if you need to quickly lighten your input colors, a Square Root node may prove more useful.