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Exquisite Saturn Images
nprev
post Feb 3 2007, 07:35 PM
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Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much! smile.gif


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Ian R
post Feb 4 2007, 08:50 PM
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I think this must be my favourite view yet:

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ohmy.gif


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Ian R
post Feb 4 2007, 09:27 PM
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QUOTE (nprev @ Feb 3 2007, 07:35 PM) *
Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much! smile.gif


Thanks nprev - I'm really flattered by your very kind words! I'm having a great deal of fun with the Cassini imagery at the moment, as you can no doubt see.

Ever since I first discovered this website, I have wondered and marvelled at the fantastic work done by the other members here - it's amazing to see so much talent in a single forum. It's very rewarding for me to finally be able to give a little bit back to the community that has provided me with so many truly great images over the past 18 months or so. smile.gif

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Ian R
post Feb 5 2007, 01:34 AM
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Here's a short GIF animation showing Cassini approaching the ring plane from below. Note how several atmospheric features can be seen moving from West to East during the sequence:

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Zooming in on the northern hemisphere:

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Ian.


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Ian R
post Feb 5 2007, 02:08 AM
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Enhanced southern-hemipshere movie (shown in reverse):

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jamescanvin
post Feb 5 2007, 02:23 AM
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More amazing stuff ohmy.gif cool.gif , thanks a lot Ian.

James


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Ian R
post Feb 5 2007, 02:36 AM
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"Saturn in Widescreen"



http://img172.imageshack.us/my.php?image=saturn4kp9.gif


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Ian R
post Feb 5 2007, 02:55 AM
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You're welcome James! smile.gif

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ElkGroveDan
post Feb 5 2007, 04:01 AM
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Ian this is great work. For some reason people have been somewhat shy of processing the Saturn images. I am glad you have stepped up to the plate and really taken on this task. Keep up the good work.

EDIT: My wife who isn't all that interested in my UMSF hobby, just glanced over my shoulder and declared "Oh, now that's nice."


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ugordan
post Feb 5 2007, 11:36 AM
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This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high.


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Ian R
post Feb 5 2007, 07:40 PM
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A new set of colour images, with some nice views of the shaded side of the rings:

Attached Image


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Ian R
post Feb 5 2007, 07:59 PM
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QUOTE (ugordan @ Feb 5 2007, 11:36 AM) *
This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high.


I do plan to go back and adjust the colour balance of these images at some point, so thanks for the pointer Gordon. Unfortunately, the stretching that is applied to these raw JPEGs means that two views that should have identical contrast, hue and saturation, end up all over the place.

What do you suggest is the best way to correct the colour in these images? Should I manually adjust the brightness and contrast of the B&W raws, or should I simply change the Red/Green/Blue values of the resultant composite? unsure.gif

Cheers,

Ian.


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ugordan
post Feb 5 2007, 09:00 PM
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When I do raw processing, I composite each footprint individually (aligning the 3 channels basically) and then paste them all into one image in Photoshop as different layers. Then comes the adjusting each footprint's color channel to match all others. Once they all match up (more or less), you can flatten the image and do brigthening/dimming of each channel to approximate the calibrated output. A calibrated output will have Saturn a dullish-yellow color, not fancy colors. You can then mix the three channels sensibly to produce a satisfactory result. Mixing will wash out saturation, but you can always increase that up later. Admittedly, it's a lot of work to work with raws and I personally kind of lost the interest to do it twice, first with raws and then do it the "proper" way once the data hits PDS.

BTW, that latest image is great! It's so Voyager-esque. In fact, you can use that moon that's visible to correct the colors a bit, make it turn white and you'll have colors closer to calibrated ones. Usually you can't rely on stuff like that, though. Did you use the violet or blue filter, this looks to me like it's violet?

Cassini spent so much time on the night side that I lost track of just how south ring shadows have actually moved.

I took the liberty of tweaking your image a bit, I hope you don't mind:

It's just way cool smile.gif


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dilo
post Feb 5 2007, 09:37 PM
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I taken some liberty too; still not perfectly matched with Gordan reccomandation, but a little more realistic.
Attached Image

Thanks again, Ian.


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tedstryk
post Feb 6 2007, 03:38 AM
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Wow, great stuff!


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