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: 2251 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 22 2017, 12:34 AM
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Planetary colors are a complicated subject and I'm not surprised to see automatic processing that includes 'delamberting' sometimes resulting in strange colors.
What I usually do when I am processing the Juno Jupiter images without removing illumination effects is to multiply green by 1.12 and blue by 2.3 after decompanding. These values are empirical and represent a weighted average from three different methods to color correct the images: (1) Simply adjusting the color of a global image until it looks 'right' (zones get whitish etc.). (2) Measuring the color of a bright zone in a higher-res image and then correcting the color to make the zone roughly white (maybe slightly yellowish). (3) Determining Jupiter's global color from a visible light spectrum and then making the average color of a global image from Juno similar. Here I attempted to account for the fact that the Juno global images show Jupiter from a vantage point that is very different from Earth-based images but did so in a preliminary way and need to do this more carefully. When I remove global illumination effects (which I do using a modified Lommel-Seeliger function - it works better than Lambert) I select a well lit and fairly big patch in the image that is not too close to the limb. I then compare the color of the patch to the same patch in an image where illumination effects have not been removed. This results in multipliers for all three color channels that I apply to the image. I do this more or less manually. |
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