Generator

What a wider gamut costs in observer agreement

Each point is the best four-primary display that reaches at least the stated fraction of sRGB's chromaticity area, scored by how far apart two hundred eyes are about its white. The curve is flat until about 1.8× and then rises steeply: agreement is free up to a point and expensive past it. The last floor asked for is not reachable at all by any set of four Gaussian emitters. The knee is the number a specification should carry and does not.

Drawn at its defaults, in a display, designed. It reads 2 options and no others: show, coverage.

Called by 2 essays

the blast radius of changing it

Matching and measuring

A fourth primary is a design

A display's fourth emitter is sold as more colour. Optimised instead against how far apart two hundred eyes are about its white — with the gamut held fixed so it cannot cheat — it buys agreement, and two and a half times closer together than three primaries reaching the same area, and the wavelengths it chooses are not the ones anybody would pick.

What it takes to deliver it

A tolerance is a region

How far a display's red primary can move before its adaptation behaviour costs anything is not a distance. It is a closed region on the chromaticity diagram, fifteen times longer one way than another, and about half of it lies outside the area a real primary can occupy — where the objective does not rise and the primary cannot go.

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