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    "abstract": "This document specifies colour-matching functions for use in colorimetry. Two sets of colour-matching functions are specified.\n— Colour-matching functions for the CIE 1931 standard colorimetric observer.\nThis set of colour-matching functions is representative of the colour-matching properties of observers with normal colour vision for visual field sizes of angular subtense from about 1° to about 4°, for vision at photopic levels of adaptation.\n— Colour-matching functions for the CIE 1964 standard colorimetric observer.\nThis set of colour-matching functions is representative of the colour-matching properties of observers with normal colour vision for visual field sizes of angular subtense greater than about 4°, for vision at sufficiently high photopic levels and with spectral power distributions such that no participation of the rod receptors of the retina is to be expected.",
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    "docSuiteTitle": "Colorimetry",
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    "docTitle": "Part 1: CIE standard colorimetric observers",
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    "docType": "Standard",
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    "group": "iso-tc-cie",
    "group$meta": {
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      "updated": "2025-12-04T17:03:11.424Z"
    },
    "href": "https://www.iso.org/standard/74164.html",
    "href$meta": {
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    "publicationDate": "2019-06-01",
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    "publisher": "ISO/CIE",
    "publisher$meta": {
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      "updated": "2025-07-01T00:00:00Z"
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    "status": {
      "active": true,
      "active$meta": {
        "confidence": "medium",
        "source": "manual",
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