At 21:04:40 UTC Mastcam Left captured the inner rim of Gale crater, almost completely obscured by haze.
To realize the extent of the obfuscation, I recommend comparing it with the image taken on December 11, 2019 (see https://www.facebook.com/PianetaMarte.MdM/posts/2591188424297668).
The sky looks decidedly milky and the crater rim is barely distinguishable. Don’t be surprised if the reddish parts of the hills in the distance are also the easiest to make out; even on Earth cars use orange headlights to see through the fog, precisely because light with a longer wavelength passes through the fog better than light with shorter wavelengths (blue light).
Note well that the sky does not tend to red, a clear indication that this is real haze (from water vapor) and not suspended dust!
The original image is a black and white encoding of the Bayer mask that has been converted to color through a process called “debayering” or “demosaicing”. In addition, the photo has undergone noise reduction due to Jpeg compression, white balance and a slight increase in microcontrast and color saturation in order to make the colors more similar to what the human eye would see.
Original image: https://mars.nasa.gov/msl-raw-images/msss/02828/mcam/2828ML0148040000208720C00_DXXX.jpg
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