Love the Saturn image, Darren! (The others are great too.) The hexagon is really sharp. It looks like you've captured some small storms or kinks in the cloud bands - any chance of putting the 7 original images together in an animation to verify?
Thanks Ray - the Saturn image is my favourite of the bunch too, would have to be my best to date. Good suggestion re: creating an animation ... I just need to tread a little carefully with the amount of time I'm putting into processing, it's creating a little tension at home lol.
Those images are **** near perfect. In particular Im impressed with the lack of artifacts on Saturn - whenever i derotate saturn i get unpleasant effects on the limbs. What settings are you using for LD (limb darkening)? Any other advice?
And as Kiwiray points out, some cloud features are well seen - I would also love to see an animation!
Thank you! Yes, I found I get some edge artefacts if I don't use some LD. But I only need a little - I set it to 95. But my feeling is that the sharpening you perform prior to de-rotation matters as well, e.g. that you need to be careful not to bring edge artefacts in from the wavelet process. (Through experimentation, I have found that you can leverage the wavelet settings to minimise the Gibbs effect, for example.) Just a gut feel though ... maybe those with more experience and knowledge of the theory could comment more authoritatively.
Exceptional imagery! Have you considered presenting at a slightly larger scale? Looks like the data can easily handle resizing.
Thanks Foehammer! The image sizes about were chosen to respect the size limitations for Cloudy Nights ... which for some reason I thought was 500px (although now that I check again, I see that I was wrong on this ... or maybe I was thinking of a different forum).
In any case, you can always see the images at what I consider to be the optimal scale given the data quality on by Astrobin page. I tend to lean towards smaller image scales as I find it more visually appealing ... I feel that when I chase larger image scales when the data quality it not quite there, my eyes get distracted by the underlying blurriness. Personal taste, I guess lol.
Brilliant (as usual), glad to see you've been able to image Saturn, every bit as good as your Jupiter shots.
One question if I may, how do you stack your 7 x 90 sec captures in WinJupos, do you do this as the raw videos or as stacked photos?
Thanks Andrew! My typical processing workflow is:
- For each capture:
- Stack the best frames using AutoStakkert (with the number/% frames depending on the quality of the data) with Drizzle set to 3.0x.
- Perform initial colour adjustment and wavelet sharpening on each stacked image in Registax.
- Measure each image in WinJUPOS then de-rotate to a single image.
- Perform some very minor "fine tuning" deconvolution in Astra Image (I find this software allows much more precise control, need at this stage as it's very easy to over-sharpen).
- Bring the resulting image into Photoshop for final touch-up and colour adjustment.
- [Edit] After tweaking in Photoshop, I export the final image. At maximum I use 33% scaling, bring it back to the original image scale of the camera. Often, however, I find scaling down further results in a more pleasing image ... around 28-30% seems to suit most captures.
Edited by DMach, 24 May 2019 - 05:07 AM.