QUOTE (scalbers @ Oct 28 2023, 03:01 AM)
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Perhaps looking at the
available calibrated radiance / reflectance data would give some further insight. As mentioned it's unusual for DSCOVR to have to deal with color of low intensity regions except right near the limb at times. Sometimes I like to look for colors of clouds along the barely visible terminator. Hopefully scattered light doesn't vary with wavelength in the camera system.
Thanks for the links. Yeah the raw epic data are 32-bit floating-point, and have no problem seeing deep into the penumbra. Here's an example during the eclipse - this is the 443nm channel, clipped on the fully-lit clouds to show detail in the shadow:
Click to view attachmentBut converting three visible channels to a colour image is non-trivial, unless the team has laid out the details for their procedure somewhere.
QUOTE (scalbers @ Oct 28 2023, 03:01 AM)
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The various effects including limb darkening of various wavelengths are somewhat accounted for (and something I hope to improve) in my simulated sky and Earth images.
Do you mean by "limb darkening" the extra absorption/scattering near the Earth's limb as viewed from the sun?
QUOTE (scalbers @ Oct 28 2023, 03:01 AM)
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Just subjectively I think the redder color shows up visually when experiencing a deep partial eclipse. If it didn't the combination of bluer color and dimmer light would look more unnatural and different from a normal sunset sequence of lighting.
Interesting thought. I'll have to pay more attention to colours if I make it to the path of April's eclipse...