Mari 4.6v4 docs:

Power Node

Access: Nodes > Math > Power

The Power node outputs the value of A raised to the power B. This can be useful to raise base color values to become darker or lighter, depending on the exponent.

For the inputs A = [R G B A] and B = [X Y Z W], the Power node performs the following calculation:

R^X, G^Y, B^Z, A^W.

Power Node Examples

Input (RGBA)

Calculation

Output (RGBA)

Input A = 1.0, 0.213, 0.063, 1.0

Input B = 1.0, 0.454, 0.454, 1.0

R = 1.0^1.0

G = 0.213^0.454

B = 0.063^0.454

A = 1.0^1.0

1.0, 0.495, 0.285, 1.0

Input A = 0.5, 0.9, 0.1, 1.0

Input B = 0.1, 0.1, 0.1, 1.0

R = 0.5^0.1

G = 0.9^0.1

B = 0.1^0.1

A = 1.0^1.0

0.933, 0.989, 0.794, 1.0

A Color node with a value of 1.0, 0.213, 0.063 raised to the power of a Color node with a value of 1.0, 0.454, 0.454.

Power Node Inputs

A	The value to raise to the power B. When no node is connected, the value defaults to the value specified in Default Input A.
B	The power to raise A to. When no node is connected, the value defaults to the value specified in Default Input B.

Power Node Properties

Default Input A text field, slider	The value to use for A if no node is connected to the A input.
Default Input B text field, slider	The value to use for B if no node is connected to the B input.
R checkbox	If checked, the red component of A is raised to the red component of power B. If unchecked, the red component is passed through to the output as the original value of input A.
G checkbox	If checked, the green component of A is raised to the green component of power B. If unchecked, the green component is passed through to the output as the original value of input A.
B checkbox	If checked, the blue component of A is raised to the blue component of power B. If unchecked, the blue component is passed through to the output as the original value of input A.
A checkbox	If checked, the alpha component of A is raised to the alpha component of power B. If unchecked, the alpha component is passed through to the output as the original value of input A.