# ColourMeanMapping enum

Namespace: [Grasshopper2.Imaging.Raycasting](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.imaging.raycasting.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public enum ColourMeanMapping
```

Enumerates the various types of RGB colour space mapping to apply to averaging colours.

## Values

| Name | Value | Description |
| --- | --- | --- |
| None | 0 | No mapping, averaging happens in sRGB. |
| Gamma20 | 1 | Gamma-adjusted averaging based on a gamma=2.0 exponent. This means blending happens in linear RGB coordinates. Gamma adjustments yield more natural blending. |
| Gamma22 | 2 | Gamma-adjusted averaging based on a gamma=2.2 exponent. Gamma adjustments yield more natural blending. |
| Gamma24 | 3 | Gamma-adjusted averaging based on a gamma=2.4 exponent. Gamma adjustments yield more natural blending. |