Processed Cassini Jupiter Images, Fun with the PDS files |
Processed Cassini Jupiter Images, Fun with the PDS files |
Aug 3 2005, 10:26 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 |
Now that I have downloaded all of the PDS formatted Cassini Jupiter images (and actually all of the Saturn images too) I have been experimenting with processing calibrated versions of them:
http://www.mmedia.is/bjj/misc/css_stuff/im...grnbl1_proc.jpg http://www.mmedia.is/bjj/misc/css_stuff/im...olor_mosaic.jpg The first one is simply a global view composed from CB1 (red), GRN and BL1 filtered images with the color balance adjusted to make it more realistic and with some sharpening applied to the image. This is a preliminary version, it looks very bluish at the limb due to Jupiter's rotation (I preferred this to color fringing at the center of Jupiter's disk). Later I plan to fix this by rotating the images in 3D space. The second one is a reprocessed version of the well known Io transit image but with the addition of the north polar region - since this is a preliminary version some seams may be visible. Later this may turn into a global mosaic. The color balance is also improved. The 'official' image seems to have been composed from CB2, (CB2+BL1)/2 and BL1 filtered images (only CB2 and BL1 images are available). Using CB2 as red makes the belts too reddish if you want whitish zones. To fix this I used a synthetic CB1 image created from a linear combination of the CB2 and BL1 images. Needless to say I also used a synthetic green image. Now the plan is to do a big cylindrical map of Jupiter followed by an even bigger one of Saturn. |
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Sep 11 2005, 05:16 AM
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Jupiter's Clouds from Cassini
http://antwrp.gsfc.nasa.gov/apod/ap050911.html |
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Sep 11 2005, 07:24 PM
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#3
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Here is a heavily processed mosaic of the Great Red Spot (GRS) I just finished. It is created from raw (PDS) images obtained close to the time of closest approach:
http://www.mmedia.is/bjj/images/jupiter_ca...grs_caption.jpg This is a mosaic of several CB2/blue images with the CB1 (red) and green images created using linear combinations of the CB2 and blue images. The effects of varying illumination across the images have been removed, the images reprojected to simple cylindrical projection and then back to perspective projection showing the GRS from directly above, thus showing the true shape of the spot. The gaps are areas for which the only available data was obtained one rotation (aproximately 10 hours) after the images I used. Due to cloud motions these images cannot be used without 'cheating'. |
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