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Juno Perijove 37, October 16, 2021
Brian Swift
post Oct 20 2021, 01:18 AM
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Preliminary cut at Europa images. 16-bit PNGs - so adjustable, but didn't see any plumes.
Applied 1.4 gamma to linear image prior to sRGB conversion to give a little contrast boost.
Haven't adjusted for Junocam reddening.
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TrappistPlanets
post Oct 21 2021, 10:57 PM
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wow beutifull!
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Bjorn Jonsson
post Oct 23 2021, 09:34 PM
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Image PJ37_16 of Europa and a computer generated image showing the viewing geometry:

Attached Image


This is an approximately true color/contrast image. The color might be a bit more inaccurate than usual since the visible light spectra I use to compute Europa's global color (this color is used as a guide when correcting the color) are obtained from the Earth and Europa's polar regions never face the Earth. In contrast, the JunoCam image shows the north polar region. The color of the polar regions differs a bit from the color of the equatorial regions and also I have not yet taken longitudinal color variations into account when estimating the color of the JunoCam image from Europa's visible light spectrum.

Interestingly I needed to use color correction that differs significantly from the correction I use when correcting the color of the Jupiter images. I'm not sure why this is but Europa became far too reddish if I used the Jupiter color correction (and Jupiter far too bluish if I used the correction I used for Europa). Maybe the fact that the red filter framelets also include some near-infrared light is a factor but this hardly explains all of this difference. There is no significant change to the Jupiter color correction needed for PJ37 compared to PJ36.
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JRehling
post Oct 23 2021, 10:21 PM
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Beautiful image! Even though the resolution is modest, the colors are wonderful.

QUOTE (Bjorn Jonsson @ Oct 23 2021, 02:34 PM) *
Interestingly I needed to use color correction that differs significantly from the correction I use when correcting the color of the Jupiter images. I'm not sure why this is but Europa became far too reddish if I used the Jupiter color correction (and Jupiter far too bluish if I used the correction I used for Europa). Maybe the fact that the red filter framelets also include some near-infrared light is a factor but this hardly explains all of this difference. There is no significant change to the Jupiter color correction needed for PJ37 compared to PJ36.


This is interesting. Europa is in actuality much brighter in IR than Jupiter. While they are approximately the same in visible light colors (when Europa passes in front of Jupiter, it can even be hard to find, depending of course on which clouds are behind it), Europa has a much broader spectrum than Jupiter, especially from the red end into IR.

Maybe this is a clue as to what's going on with the gradual reddening of Jupiter.
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Brian Swift
post Dec 9 2021, 06:14 PM
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PJ37 Jupiter Images. Exaggerated Color/Contrast. Using new color balance.
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Full resolution version (21866-by-28946) available at https://www.missionjuno.swri.edu/junocam/processing?id=11988
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