Juno perijove 5, March 27, 2017 |
Juno perijove 5, March 27, 2017 |
Mar 16 2017, 10:24 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Juno's perijove 5 is coming up less than two weeks from now - it's on March 27, 2017.
The target selection voting has started and is open until almost four days from now: https://www.missionjuno.swri.edu/junocam/voting?current A large part of the data volume will be reserved for polar time lapse sequences though. John Rogers has written a helpful summary of the upcoming perijove 5: https://www.britastro.org/node/9377 |
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May 20 2017, 02:07 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Youtube upload of Perijove-05 animation completed.
Youtube refused my AVI version; so I needed to upload a terribly large 500 MB+ MOV file. However, quality may have suffered a bit in the youtube version. The bluish-green can be of at least two reasons: - Jupiter's haze appears to be bluish, especially when seen from acute angles, and near the poles. - Some portions of some of the images are saturated in the red filter band, resulting in a cast to the complementary color, i.e. greenish-bluish. This risk has been taken, in order to obtain better S/N. |
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May 21 2017, 04:59 PM
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
The bluish-green can be of at least two reasons: - Jupiter's haze appears to be bluish, especially when seen from acute angles, and near the poles. - Some portions of some of the images are saturated in the red filter band, resulting in a cast to the complementary color, i.e. greenish-bluish. This risk has been taken, in order to obtain better S/N. I recall some discussion about a greenish cast showing up in the Earth flyby images. Perhaps the red band was saturated there also? Unsure if the haze would have been a factor in this case. Would be interesting to model the expected color of Jupiter's haze and clouds with a scattering code. Maybe this would be kind of drastic, though I wonder if reducing the color saturation in areas where the red is saturated on the bright end would help? Would this help get a better color balance in low intensity areas? Perhaps this is the S/N tradeoff being mentioned. Indeed the bright clouds should be a good white reference, at least near the nadir if the sun is reasonably high up. It is a challenge to maintain a good color balance with strong contrast enhancement, so perhaps a version with less contrast and more accurate hues would be interesting as well. -------------------- Steve [ my home page and planetary maps page ]
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May 21 2017, 06:21 PM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Perhaps the red band was saturated there also? AFAIK any saturation is only happening near the limb in some of the images. Even the nadir portions of these images are greenish in many cases. There is probably a greenish/yellowish cast to images that have no color correction applied. We've reported the band correction factors in the PDS products but I've never actually validated those so if there's still some residual artifact I wouldn't be surprised. As I say, we're using a simple auto white balance which seems to work all right for Jupiter. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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