Voyager mosaics and images of Jupiter, A fresh look at some ancient stuff Options

[meryon]

Wow all these informations for me! Thanks

Maybe i can virtualize some system like Redhat or OSX to extract these files ?

Yes I work on Photoshop but I see that is not the best way for this kind of work. I read that there was a plugin for Gimp but it seems that it's not updated from a long time.

We keep in touch. Thanks again !

[Phil Stooke]

Those compressed IMQ files are the older versions of the archive. If you go in through here:

http://pds-rings.seti.org/voyager/iss/calib_images.html



This site links through to the uncompressed IMG versions of the files, which should open as RAW images.

Here's an excerpt from a file header:


OBJECT = IMAGE LINES = 800 LINE_SAMPLES = 800 SAMPLE_TYPE = UNSIGNED_INTEGER SAMPLE_BITS = 8



Phil

[meryon]

Just for fun.

Voyager I & II - Jupiter Encounter Observations

I have created an animation based on all RAW images from volume VGISS_5101 to VGISS_5214.

I added the image name for each frame.

I don't know if it can be useful for you.

Now I have to work on the image processing.

[tasp]

Best example of the difference between the narrow angle camera and the wide angle one, for sure.

Greater appreciation for the work of the JPL wizards in writing their imaging sequences, realizing virtually every shot the Voyagers took was discussed and planned and specific instructions for each image in regards to filters, pointing and exposure length had to be considered.

That was an ENORMOUS task planning and executing all those pictures, an amazing achievement.


And thank you very much for posting that !!

[meryon]

Thank you !

I will do the same thing for Saturn and maybe Uranus and Neptune.

[tasp]

I had no idea one picture returned from Jupiter every 44 seconds (and I'm neglecting all the other data streams in the bandwidth) when accumulated at the high frame rate you used would run over 10 minutes !!!

Even in the far approach phase, it was apparent Jupiter was covering more pixels and growing in size as the distance decreased. The 'ride along' aspect was fun.

[meryon]

You will find the Saturn animation on this thread : Voyager I & II - Saturn Encounter Observations - RAW Images

[jccwrt]

I tried my hand at putting together one of the departure mosaics that Voyager 1 took a few days after closest approach. As far as I know, this was the largest one that captures most of crescent Jupiter. There's a few taken prior to this but it looks like they may be overexposed and/or have large data gaps along the limb.


Voyager 1 - Jupiter Mosaic - 1979-03-11 by Justin Cowart, on Flickr

I really like the vantage point, and I'm planning to tackle a few more of the more distant two-frame mosaics that capture the entire crescent.

[machi]

Fantastic work Justin!
Maybe little advice from the old nitpicking pixel peeper.
Voyager's images are stripy if contrast is enhanced. It's very easy to remove this by destriping.
For example GIMP has very nice filter for destripe of periodic vertical lines.
Horizontal stripes can be easily removed by deinterlace function.

[jccwrt]

Thanks for the tip, machi! I'll have to try that out.

[jccwrt]

Put together a mosaic of Jupiter's north polar hood taken by Voyager 1. I got a chill up my spine when these were all stitched together for the first time.


Jupiter 1979 March 1 by Justin Cowart, on Flickr

I did attempt removing some of the stripes in the image, but since I'm using the geometrically corrected images from the Rings node they're all slightly warped. I did manage to reduce the intensity of some of those, but they're still visible in places if you go looking for them. I think the unsharp mask that I used to sharpen some of the detail may have hurt a little in that regard.

[Ian R]

Magnificent, Justin! Immediately shared on Twitter to show just how good the Voyager data-set is.

[machi]

Justin, it's flawless, beautiful, splendid!

[tedstryk]

Excellent work, Justin!

[jccwrt]

Thanks for the kind words, everyone. I have a couple more contributions to the thread before I take a break from working on Voyager pictures for a little while.

First up is a global mosaic taken by Voyager 2 on June 30, about 10 days before closest approach.


Jupiter 1979 June 30 by Justin Cowart, on Flickr


The second one is a little more interesting, because it has a small mystery I've been unable to solve. I was looking for some high-res mosaics of Jupiter's clouds to put together, and in one of these sets I saw a small dot in the corner. At first it looked like a stray reseau mark that the Rings node calibration process missed, but comparing it to the next image taken, it moved:



It's a moon's shadow, but I haven't been able to determine exactly which one of the inner moons produced it. A check of the Jupiter viewer has narrowed it down to Amalthea or Adrastea. Any thoughts?

I've also assembled the frames from this imaging sequence into a mosaic, the shadow barely squeaks in at the top left corner when all is said and done:


Southern Hemisphere Cloud Mosaic - 1979 March 2 by Justin Cowart, on Flickr