This is not really a question, more like a discussion starter but it does not fit under tips and thanks either. The color temperature of light coming from the sun changes constantly during the day, in different seasons, and in different weather conditions, because of the angle of the sun and the amount and quality of atmosphere that the light is passing through. Newer LED lightbulbs are often labeled with how “warm” or “cool” (yellow-orange or blue-green) the light is, but this is not a novel technological phenomenon. The local color of the two pieces of paper is the same, but the perceived color is very different: the first will appear much more warm and yellow and the second more cool and blue-green because what is called the “color temperature” of the two sources of light is different. Compare two identical pieces of white paper, one lit by a “soft white” light bulb (2700 Kelvin) and the other by a “daylight” light bulb (5000-6000K). Renoir’s radical change in color usage in the later painting is related to the Impressionists’ interest in the divergence between the local color of the object and the color actually perceived by the eye under specific lighting and atmospheric conditions.
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