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// Calculate deltaE ITP

// scaled root sum of squares

// ITU-R BT.2124-0 Annex 1

/**

* @param {number[]} reference - Array of ICtCp: I as 0..1, Ct and Cp as -1..1

* @param {number[]} sample - Array of ICtCp: I as 0..1, Ct and Cp as -1..1

* @return {number} How different a color sample is from reference

*/

function deltaEITP (reference, sample) {

let [I1, Ct1, Cp1] = reference;

let [I2, Ct2, Cp2] = sample;

let ΔI = I1 - I2;

let ΔT = 0.5 * (Ct1 - Ct2);

let ΔP = Cp1 - Cp2;

return 720 * Math.sqrt(ΔI ** 2 + ΔT ** 2 + ΔP ** 2);

}