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Originally Posted by strongmanmike
Have to say Mike, pretty impressive!
While the movie is very interesting I actually like the stills the best and particularly the detail visible in the Red and Green data.
If I may ask and since you are nocking on their door, in the very best planetary images I've seen, the processing artifact that seems the hardest to remove is the thin peel like border that usually shows itself on the planets limb. Can you remove or reduce this or would it mean losing some of the sharpness?
This is one of the things that seems to set Damien and Maurice et al's planetary images apart from the rest IMO ie a very natural but clean transition from planet to dark sky?
This is of course a very minor comment and the technical skill shown in these Jupter shots is excellent.
Mike
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Hi Mike. The "hard edge" is due to the sharpening algorithms we use, and of course nearest the black edge is where it gets most pronounced, as the data is sharpened from gradient to hard white against black. I agree it can be off-putting and can sometimes detract from an otherwise good image.
In very good seeing (when people like Damian and Maurice post their very best work), the artifact doesn't show up much at all because the shape of the planet hasn't changed much like it does in poorer seeing, when it requires more sharpening to try and extract some detail. It can also show up more if you attempt to over-sharpen given the data you've got.
I think in general though, it comes down to selective processing to avoid that hard edge. I have lately started doing a small guassian blur around a feathered selection at the edge of the disc to reduce the hard edge artifact. It would also be just as easy to selectively sharpen the middle part of the image so the limb gradients aren't changed. I wouldn't be surprised if the guys like Damian do process in this way to avoid the artifact.
Thanks for your thoughts, it's prompted me to be more careful next time and try to avoid them.
, can i ask a question? what sort of scope can an image like this be seen through? i seen you said it was a 12" scope so if i was to buy say a lightbridge 12" could i get results similar to these?
