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Posted by: ugordan Dec 2 2005, 04:34 PM

From the PDS data, consists of only two multispectral footprints taken during the encounter. I used IR1 + BL filters with a synthetic green to minimize problems with changing viewing geometry during different exposures. The end result is practically the same, color-wise. The image stitching could have been better, but I believe it's fairly decent as is.

Posted by: volcanopele Dec 2 2005, 06:03 PM

? I just looked at the GLOCOLA sequence, where you got those images, and there are GRN filter images for both footprints. Why the synthetic image? The GRN images are N1483150949_1 and N1483150968_1 for the bottom frame and N1483152093_1 for the bottom frame. If you want a true color mosaic, there are also RED filter images for both frames (top=N1483152247_1 and bottom=N1483151197_1).

EDIT: AHHH! I should have read the ENTIRE post. Sorry, you wanted to prevent fringing... Iapetus rotates so slowly and the encounter was so slow that you shouldn't have that problem...

Posted by: ugordan Dec 2 2005, 06:09 PM

I know there are GRN images as well as RED ones but the time between exposures produces bad color fringing. IIRC, the IR1 and BL1 were taken immeiately one after the other so the perspective is close to identical. Also I wanted to see what could be one with only 2 filters. I think the end result looks very similar to the official CICLOPS release.

I don't have any software that's able to reproject all images to the same viewing geometry, if you know any such programs, I'm listening...

EDIT on your edit: There *shouldn't* be fringing, but believe me there is... There are many different filters used and the readout times just add up...

Posted by: tedstryk Dec 2 2005, 06:34 PM

One thing you could do for gap fill is generate a wide angle color view, and then overlay it on higher resolution black and white data for the areas not covered by high resolution color data.

Posted by: ugordan Dec 2 2005, 06:38 PM

Tried that. Actually, I gave up at the point on trying to fit the NAC clear frame of the belly-band, the viewing angle is so much different than this mosaic, it just wouldn't fit.
Without any proper processing tools, this is about the best I can do... Even with better tools I wonder how much better one can do, given the *weirdest* shape of this moon.