---
title: "Bias"
url: "https://help.maxon.net/c4d/en-us/Content/html/COM_REDSHIFT3D_REDSHIFT4C4D_NODES_CORE_RSMATHBIAS.html"
section_path: "The Node Editor > Redshift Nodes > Redshift Math Nodes > Math Float Nodes > Bias"
element_id: "COM_REDSHIFT3D_REDSHIFT4C4D_NODES_CORE_RSMATHBIAS"
description: "This page documents the Bias node of the Redshift renderer in Cinema 4D. It bends values along Ken Perlin's bias curve — a one-parameter way to push mask …"
---

# Bias

> **Note:** **What is it about?**
>
> This page documents the **Bias node** of the Redshift renderer in **Cinema 4D**. It bends values along Ken Perlin's bias curve — a one-parameter way to push mask mid-tones brighter or darker, similar to a gamma tweak.

Returns a curved bias of *Input* by *Bias*, using the following Ken Perlin formula: pow(*Input*, log(*Bias*)/log(0.5)).