# Configuring the VideoFxProcessor object for the Amazon Chime SDK
<a name="configure-videofxprocessor"></a>

The following tables list the `VideoFxProcessor` properties that you can configure. The example below the tables shows a typical runtime configuration.

**Background blur**  
Background blur takes the following properties:


| Property | Type | Description | 
| --- | --- | --- | 
| `isEnabled` | `boolean` | When `true`, the filter blurs the background. | 
| `strength` | `string` | Determines the extent of blurring. Valid values: `low` \$1 `medium` \$1 `high`. | 

**Background replacement**  
Background replacement takes the following parameters:


| Property | Type | Description | 
| --- | --- | --- | 
| `isEnabled` | `boolean` | When `true`, the filter replaces the background. | 
| `backgroundImageURL` | `string` | The URL of the background image. The filter resizes the image dynamically to the dimensions of the current screen. You can use a string such as `https://...` or a data URL such as `data:image/jpeg;base64`. | 
| `defaultColor` | `string` | A hex color string such as `000000` or `FFFFFF`, or a string such as `black` or `white`. If you don't specify an image URL, the processor uses the `defaultColor` as the background. If you don't specify a `defaultColor` the processor defaults to black. | 

**Changing a configuration at runtime**  
You can change a `VideoFxProcessor` configuration at runtime by using the `videoFxProcessor.setEffectConfig` parameter. The following example shows how to enable background replacement and disable background blur.

**Note**  
You can only specify one type of background replacement at a time. Specify a value for `backgroundImageURL` or `defaultColor`, but not both.

```
videoFxConfig.backgroundBlur.isEnabled = false;
videoFxConfig.backgroundReplacement.isEnabled = true;
try {
  await videoFxProcessor.setEffectConfig(videoFxConfig);
} catch(error) {
  logger.error(error.toString())
}
```

If `setEffectConfig` throws an exception, the previous configuration remains in effect. `setEffectConfig` throws exceptions under conditions similar to those that cause `VideoFxProcessor.create` to throw exceptions.

The following example shows how to change a background image while the video runs.

```
videoFxConfig.backgroundReplacement.backgroundImageURL = "https://my-domain.com/my-other-image.jpg";
try {
  await videoFxProcessor.setEffectConfig(videoFxConfig);
} catch(error) {
  logger.error(error.toString())
}
```