Delta E (ΔE, ΔE2000, ΔE ITP)
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Delta E is the colour error compared with a reference. A ΔE2000 below 1 is almost impossible to see. A ΔE2000 below 3 is generally fine. ΔE ITP (ITU-R BT.2124) is for HDR. Reviewers measure ΔE for grayscale and for colour.