Juno Perijove 56, November 22, 2023 |
Juno Perijove 56, November 22, 2023 |
Nov 29 2023, 09:24 PM
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#1
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
Some of the images have been posted on missionjuno.
You will immediately notice that there is something weird about them. Yes, we know about this, and I'll say more about it when I can. In the meantime, anything people can do to process them would be appreciated. I've had some success using https://github.com/chunglabmit/pystripe -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Dec 23 2023, 12:29 AM
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#2
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Creating synthetic images using a linear combination of two colors doesn't work as well for Io as it does for e.g. the other Galileans or even Jupiter. Using violet and green to create synthetic blue images works fairly well using something like B=G*w+V*(1-w) (and maybe also multiplying this with a value close to 1 but not exactly 1). However, something comparable doesn't work well if you want synthetic red from IR756 and green Galileo images. I experimented with this years ago when I wanted a closer to true color version of the Galileo C21 global mosaic of Io. I ended up using a non-linear combination of IR756 and green with great results. This had one major drawback though: It worked well only for Io's anti-Jupiter's hemisphere. For the subjovian hemisphere a different formula was needed.
And now something different, a north polar map of Jupiter created from a mosaic of the PJ56_145 and PJ56_147 images. This is from the red channel only. The contrast has been increased. |
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