linearExposure

For HDR colors, the linear brightness multiplier that was applied when generating the color. Colors created with an exposure by NSColor create CGColors that are tagged with a contentHeadroom value. While CGColors created without a contentHeadroom tag will return 0 from CGColorGetHeadroom, NSColors generated in a similar fashion return a linearExposure of 1.0.

var linearExposure: CGFloat { get }