Painting a landscape in a cloudy day, the sky light is pretty neutral (gray), but is the light warm or cool? To be honest with you, I was not sure. So I run my "Warm-n-Cool" filter (see my previous post) on the reference photo. Lo and behold, it is warm for sure. I guess the physics does make sense. Behind the clouds, we have the sun and the blue sky. The warm sun light dominates the cool blue sky. The cloud works as a diffuser, and average out the light. So the stronger sun light makes the skylight warmer.
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