Reflectance, Exposure and Transfer Function
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This spreadsheet associates reflectance values with IRE units using the transfer function (OETF) specified in ITU BT.709. Reflectance values are given for an 11-step "chip chart" and for the neutral (bottom row) patches of the Macbeth color checker chart as well as for an 18% gray card.
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Chip no.ReflectanceVideo Percent8-bit Digital CodeStops10-bit Digital CodemV ITU BT.1358
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#1 Reference White90%100.02352.3940700
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#274%90.72152.0859
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#360%81.71951.7779
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#4 (Caucasian flesh tone, apx.)47%72.11741.4696
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#536%62.91541.0615
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#6 Center chip of 11-step chart26%53.01320.5528
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#719%44.71140.1455
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18% Gray18%43.41110.0444304
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#813%36.796-0.4386
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#98%27.175-1.2301
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#105%20.060-1.8239
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#112%9.938-3.2151
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Capped lens00.016-7.5640
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Macbeth #1991.5%100.82372.3947
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Macbeth #2059.7%81.51941.7778
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Macbeth #2136.7%63.51551.0620
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Macbeth #2219.4%45.21150.1460
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Macbeth #238.80%28.779-1.0315
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Macbeth #242.8%13.245-2.7179
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Gamma0.45
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Sync-300
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-7.305936073
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100
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