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As long as all of the light sources are close to ideal black body radiators, then the spectrum of light they emit will be "neutral" with respect to plus/minus green, and shouldn't contain aberrant spectral spikes. Sunlight and tungsten light are both close ideal; black body radiation at a temperature of 5600ยบK is very close to the color of ...


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You're doing it wrong. For one, the 18% grey card is for exposure, use a white card for white balance. For two, the whole point of the white / grey card is that you expose it under the lighting conditions of the scene, so that whatever colour the lights are is treated as white (and in the case of the grey card, so you get correctly exposed skin tone (ish.)). ...


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