Anonymous
10/18/2025, 7:02:51 PM
No.7763532
>>7762928
A blue surface absorbs all wavelengths except blue.
The proportion of blue light in sunset light is reduced when compared to full daylight. The atmosphere always scatters some of the blue light, hence it's blue appearance. At sunset, the steep angle of the sunlight means the path though the atmospheric layer is much longer, filtering out much more of the available blue light.
Your blue surface still reflects only blue light, but there is less of it. So a blue surface will appear darker, and somewhat grayer. The yellowness of the light doesn't make it greenish.
However, some blues are not pure. If your blue is already slightly greenish at noon, it has the capacity to reflect some yellow light. In the intense yellow light of sunset, the yellow component will become more prominent, making the surface appear a bit more green.
Also, many surfaces reflect differently depending on the angle of incidence of the light. Like the surface of water, or the body of a car. So parts of the blue car you face directly will absorb everything but blue, but parts seen at a glancing angle may reflect all light well. Those angled pieces will look like reflections of the sky rather than blue. Gently angled surfaces will reflect the reduced blue inherent in sunset light but also partially reflect the colors of the sunset sky itself. This overlay could give you a greenish result.
But wait, you also get: simultaneous contrast. If you have a blue object and the surroundings appear yellow due to the sunset, this will pronounce the blueness of the object.
The simple answer is: you have blue stuff. soon enough, you will have sunset. Take blue stuff outside.
A blue surface absorbs all wavelengths except blue.
The proportion of blue light in sunset light is reduced when compared to full daylight. The atmosphere always scatters some of the blue light, hence it's blue appearance. At sunset, the steep angle of the sunlight means the path though the atmospheric layer is much longer, filtering out much more of the available blue light.
Your blue surface still reflects only blue light, but there is less of it. So a blue surface will appear darker, and somewhat grayer. The yellowness of the light doesn't make it greenish.
However, some blues are not pure. If your blue is already slightly greenish at noon, it has the capacity to reflect some yellow light. In the intense yellow light of sunset, the yellow component will become more prominent, making the surface appear a bit more green.
Also, many surfaces reflect differently depending on the angle of incidence of the light. Like the surface of water, or the body of a car. So parts of the blue car you face directly will absorb everything but blue, but parts seen at a glancing angle may reflect all light well. Those angled pieces will look like reflections of the sky rather than blue. Gently angled surfaces will reflect the reduced blue inherent in sunset light but also partially reflect the colors of the sunset sky itself. This overlay could give you a greenish result.
But wait, you also get: simultaneous contrast. If you have a blue object and the surroundings appear yellow due to the sunset, this will pronounce the blueness of the object.
The simple answer is: you have blue stuff. soon enough, you will have sunset. Take blue stuff outside.