# llsRGB2Linear

*LSL function*

```lsl
vector vector llsRGB2Linear(vector color);
```

- `vector color`: Color vector in the sRGB colorspace to convert.

- Returns: `vector`
- Energy: 10

Returns a [vector](https://wiki.secondlife.com/wiki/vector) Transforms a color specified in the sRGB colorspace to the linear RGB colorspace.

```lsl title="How to use" frame="terminal"
vector result = llsRGB2Linear(ZERO_VECTOR);
```

## Specification

Lights in Second Life are specified in LSL as linear red, green blue values in the range (0.0, 1.0). Internally light calculations are performed in the sRGB colorspace.

The sRGB (Standard Red Green Blue) colorspace is defined in [IEC 61966-2-1:1999](https://www.color.org/srgb04.xalter) and was developed as a joint project between Microsoft and HP.

This calculation is known as an Electro-Optical Transfer Function (EOTF).

## Caveats

- The name of this function is actually a misnomer as LSL color is actually in [Rec.709](https://www.color.org/chardata/rgb/BT709.xalter) space, not [sRGB](https://www.color.org/chardata/rgb/srgb.xalter) space. While they are very similar, the gamma value for sRGB is approx. 2.2, whereas the gamma value for Rec.709 is approx. 2.4.
- Scripting for PBR-enabled viewers: If you enter color vectors manually, using the viewer's color picker, enter them as sRGB values. The color picker automatically converts them internally to Linear RGB, so someone using a PBR-enabled viewer will see them correctly. When you apply color vectors directly with a script, however, you must apply sRGB to Blinn-Phong textured faces and Linear RGB to PBR materials.

## See also

### Functions

- [llLinear2sRGB](/functions/llLinear2sRGB/)

To convert from the Linear colorspace to sRGB. (Inverse EOTF)

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*Source: [LlsRGB2Linear](https://wiki.secondlife.com/wiki/LlsRGB2Linear) on the Second Life Wiki. Content from the Second Life Wiki article LlsRGB2Linear (revision 1217966, 2025-02-07), CC BY-SA 3.0.*

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From lsl.dev: https://lsl.dev/functions/llsRGB2Linear/