Voyager mosaics and images of Jupiter, A fresh look at some ancient stuff |
Voyager mosaics and images of Jupiter, A fresh look at some ancient stuff |
Aug 20 2010, 05:47 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 |
Thanks to modern computers and software the old, 'official' Voyager Jupiter images can be reprocessed into something much better. There is also a lot of Voyager data there that was never processed into color composites and/or mosaics (or at least it has not appeared on the WWW). With proper processing the apparent image quality approaches the quality of the Cassini images but needless to say the wavelength coverage is (vastly) inferior.
I have recently been taking a close look at the high resolution Voyager 1 images, i.e. the images obtained in early March 1979. This is going to result in some new and/or reprocessed mosaics. The first one is now complete and I'm working on another one. The image below is a 12 image mosaic (12 orange + 12 violet + 12 synthetic green images). The images were obtained on March 2, 1979 at a range of 4.3 million km. The first image (C1629045.IMQ) was obtained at 05:09:23 and the last one (C1629131.IMQ) at 05:46:11. The resolution is roughly 43 km/pixel. The raw images were calibrated, reprojected to simple cylindrical projection, mosaicked and then rendered using a typical viewing geometry (there is no such thing as a "correct viewing geometry" because the images were obtained over a 37 minute period with Jupiter rotating). I then fixed the color balance. I still haven't 'standardized' how I process the Voyager color. I wasn't completely satisfied with the color I got using an approach similar to what's described in another thread but I think the color could be improved a bit. The final step was to sharpen the resulting image a bit, mainly to compensate for all of the resampling that the previous processing steps required. This image shows lots of features: The Great Red Spot and one of the three white ovals present during the Voyager flybys, smaller spots, scallopped belt/zone boundaries, gravity waves, a bright equatorial plume and the dusky south polar region. I don't think I'm bragging by saying that this is probably the best Voyager 1 Jupiter mosaic that I know of, mainly because of its size (12 images). I will be posting more Jupiter stuff in this thread in the coming days/weeks, both mosaics and interesting images (and needless to say, others are welcome to post images and mosaics as well). |
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Oct 7 2015, 07:00 AM
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Junior Member Group: Members Posts: 45 Joined: 27-August 14 From: Private island on Titan Member No.: 7250 |
Thanks guys! It really means a lot to be praised by big leaguers like y'all when my processing capabilities are this limited; basically all I can do at the moment is take Planetary Rings Voyager and Cassini .jpegs and stabilize the targeted object in Final Cut Pro manually, frame by frame, because I can't access any professional photo editors and have no idea how to write command prompts. Plus I use a Mac, and maybe I haven't done enough reading but that also seems to limit the number of utilities potentially at my disposal.
If I could have one question answered, it'd be this: how do I know I'm mixing differently filtered images correctly? I know which images are supposed to fill in for which RGB channels, but I have no idea how much of each filter I'm supposed to mix, and so I've had Uranus come out looking white and basically like a cue ball, Neptune looking pale red, Saturn looking slightly purple, etc. And I've been using the highest level processed images - the cleaned up ones with geometrical corrections and calibrations. I know stuff like Voyager images will never feature the kind of color humans would see due to the wavelengths chosen for some of the filters, but I just get the feeling there's a proper way for these filters to be combined and I'm not doing it, because my color keeps coming out like nothing I've seen on here or anywhere else. I'm not interested in getting color that is completely accurate to what a human eye would see, or in cleaning up images any more than they've already been cleaned in the processed versions, or in interpolating a very short, choppy series of frames - I just want to be able to stabilize and animate image sequences with color that is authentic to the data, using synthetic green channels if necessary. Then I can work on finding a way to warp the images to align different filters more accurately and create animations out of multiple mosaics! -------------------- aka the Vidiconvict
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