---
title: "hdr10(minLuminance:maxLuminance:opticalOutputScale:)"
framework: quartzcore
role: symbol
role_heading: Type Method
path: "quartzcore/caedrmetadata/hdr10(minluminance:maxluminance:opticaloutputscale:)"
---

# hdr10(minLuminance:maxLuminance:opticalOutputScale:)

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

## Declaration

```swift
class func hdr10(minLuminance minNits: Float, maxLuminance maxNits: Float, opticalOutputScale scale: Float) -> CAEDRMetadata
```

## Parameters

- `minNits`: The minimum nits (cd/m^2) of the mastering display.
- `maxNits`: The maximum nits (cd/m^2) of the mastering display.
- `scale`: A scale factor relating (display-referred linear) extended range buffer values to the optical output of a reference display.

## Return Value

Return Value A new EDR metadata object.

## Discussion

Discussion Any content greater than the maximum luminance (maxNits) may be clamped when displayed. The values in the drawable’s texture are assumed to be proportional to the optical output (in cd/m^2) of the reference display. For example, if the optical output scale is 100, then a value of 1.0 is assumed to be 100 nits. If the content is in a normalized pixel format, set opticalOutputScale to 10000.

## See Also

### Retrieving HDR10 Metadata

- [hdr10(displayInfo:contentInfo:opticalOutputScale:)](quartzcore/caedrmetadata/hdr10(displayinfo:contentinfo:opticaloutputscale:).md)