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| von Helmholtz 1859: |
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| Trichromatic color theory |
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| Ancestor of the CIE-XYZ color space |
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| Violet |
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| Blue |
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| Green |
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| Yellow |
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| Orange |
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| Red |
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| Short
wavelength receptors |
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| Medium
wavelength receptors |
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| Long wavelength
receptors |
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