Bias node

Access: Nodes > Math > Bias

Skews a [0.0, 1.0] value toward 0 or 1 using a power curve. A Bias of 0.5 is the identity. Useful for adjusting the density of procedural noise masks without clipping the pure black and pure white edges.

The input is clamped to [0.0, 1.0] range.

Input (RGB)	Output (RGB)
0.5, 0.5, 0.5	0.5, 0.5, 0.5 (identity curve at b = 0.5).
0.25, 0.25, 0.25 with Bias = 0.25	0.0625, 0.0625, 0.0625 (pulls midtones toward dark)
0.25, 0.25, 0.25 with Bias = 0.75	0.5, 0.5, 0.5 (pulls midtones toward bright).

Bias node inputs

Input

The input gradient in the range 0.0-1.0 to be skewed.

Bias node outputs

Output

The input remapped using Perlin-Hoffert bias curve b(p=ln(b)/ln(0.5)).

Bias properties

Bias	The gradient of which to bias the input. At Bias = 0.5 the output is unchanged. Below 0.5 the midtones are pulled toward black; above 0.5 they are pulled toward white.