# BC4

> Compressed one channel (R) texture format.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
BC4 = 26
```

### Remarks

BC4 format compresses textures to 4 bits per pixel, keeping only the red color channel. It is widely supported on PC and console platforms.

It is a good format to compress single-channel textures like heightfields or masks. For two channel textures, see [TextureFormat.BC5](/engine/6000.0/script-reference/unityengine/textureformat/bc5.md).

Additional Resources: [Texture2D.format](/engine/6000.0/script-reference/unityengine/texture2d/format.md), [texture assets](/engine/6000.0/manual/materials-and-shaders/textures/textures-getting-started/textures.md).