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# Determining support for EDR values

Check whether a display supports EDR.

## Discussion

Discover whether a display supports EDR values by reading the
<doc://com.apple.documentation/documentation/AppKit/NSScreen/maximumPotentialExtendedDynamicRangeColorComponentValue>
property on an
<doc://com.apple.documentation/documentation/AppKit/NSScreen> instance for that display.
A value greater than `1.0` indicates that the display supports EDR values;
otherwise, the display supports only SDR values.

This property’s value is independent of the current state of the display.
It’s possible for a display to support EDR but to be unable to present those values right now.
For information about the current state of the display, check the
<doc://com.apple.documentation/documentation/AppKit/NSScreen/maximumExtendedDynamicRangeColorComponentValue> property.

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