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  "title" : "CAEDRMetadata"
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# CAEDRMetadata

Metadata describing how extended dynamic range (EDR) values should be tone mapped.

```
class CAEDRMetadata
```

## Overview

If you need specific tone-mapping behavior, set the [`edrMetadata`](/documentation/QuartzCore/CAMetalLayer/edrMetadata) property of a [`CAMetalLayer`](/documentation/QuartzCore/CAMetalLayer) to point to an instance of this class.

## Topics

### Retrieving Hybrid-Log Gamma Metadata

[`hlg`](/documentation/QuartzCore/CAEDRMetadata/hlg)

Extended dynamic range (EDR) metadata for the Hybrid Log-Gamma (HLG) transfer function.

### Retrieving HDR10 Metadata

[`hdr10(displayInfo:contentInfo:opticalOutputScale:)`](/documentation/QuartzCore/CAEDRMetadata/hdr10(displayInfo:contentInfo:opticalOutputScale:))

Creates EDR metadata for HDR10 content based on mastering display color information and content light levels.

[`hdr10(minLuminance:maxLuminance:opticalOutputScale:)`](/documentation/QuartzCore/CAEDRMetadata/hdr10(minLuminance:maxLuminance:opticalOutputScale:))

Creates EDR metadata for HDR10 content based on the luminance characteristics of a mastering display.

### Type Properties

[`isAvailable`](/documentation/QuartzCore/CAEDRMetadata/isAvailable)

### Type Methods

[`hlg(ambientViewingEnvironment:)`](/documentation/QuartzCore/CAEDRMetadata/hlg(ambientViewingEnvironment:))


---

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