View Full Version here: : Final reprocess of extended corona (I think!)
Paul Haese
24-11-2012, 03:24 PM
I put this together with Fitsworks as suggested in another thread here. I found it handles the onion rings and sharpening really well. Only did a little more in photoshop to complete the image.
Click here (http://paulhaese.net/CairnsTSE14Nov2012composite.html)fo r larger image
Feel free to give me your opinion. Looking for ideas.
Edit: the image that was attached to this link is no longer on my site. This is the replacement image.
Larryp
24-11-2012, 03:27 PM
Lovely image, Paul!:thumbsup:
gregbradley
24-11-2012, 04:18 PM
Very good Paul.
Seems stretched a bit thin but you got the detail and no onion rings which plagues these images.
Greg.
Paul Haese
24-11-2012, 06:40 PM
Thanks guys.
I think your original comments were more spot on Greg and I fully concur. I expected more too, but I think several things are going on here. I know there was very thin high cloud about and it can be seen in some of my wifes shots. That may have contributed to it. I also wonder if the dynamic range is being haltered a little. I did only use 8 images for this image as suggested by a tutorial I read and perhaps this is contributing to the problem and as you now say it looks stretched thin. I am planning on perhaps using 30 images and maybe this will give the range I am after??? Time will tell but at least the onion rings are gone and the detail is sharper than previous attempts. If I make a significant improvement I will post an image in this thread.
gregbradley
24-11-2012, 06:53 PM
Sounds spot on. Like an astro image that hasn't gotten enough subs yet.
Greg.
Peter Ward
24-11-2012, 08:21 PM
Humm...the noise dominates quite a bit, plus the limb-coronal boundary lacks highlight detail. ( I used about 18 raw images for my 2006 TSE shot )
Canon DSLR's have way better noise supression these days, but even then, the image breaks down when you push the data too much.
Might be a case of less is more.
geoffsims
24-11-2012, 08:56 PM
Hi Paul,
This is looking exceptional! Nice work.
My only comment is that, particularly around the upper limb, the corona is saturated. You should be able to find one of your shorter exposures and blend that part in.
Keep playing, it's looking great.
RickS
24-11-2012, 09:48 PM
Definitely an improvement again, Paul! I'm sure you can squeeze a little more out of it :thumbsup:
Paul Haese
25-11-2012, 09:08 AM
Ok final repro. I sorted a lot of the noise and to some extent the saturation around the limb. I stacked 35 images and this helped control the noise a lot better.
Click here (http://paulhaese.net/CairnsTSE14Nov2012composite.html)fo r the larger image ( I have replaced the other image)
I have also included another smaller image below for comparison from the first one here.
strongmanmike
25-11-2012, 09:59 AM
Looks great Paul, plenty of detail in the corona there, a fitting record of your trip to Cairns I recon :thumbsup: .
Mike
RickS
25-11-2012, 10:05 AM
Very nice, Paul, and interesting to see the step-by-step refinement of the image.
gregbradley
25-11-2012, 10:11 AM
That's nicer Paul. I think the rest is seeing.
One thing. The moon is jet black. I played around with an image Houghy posted and I could get it to show some lunar detail.
Especially seeing as you used a Nikon D3 which probably has really good shadow detail dynamic range. You may be able to super push and super contrast the moon and get some detail.
Greg.
DavidTrap
25-11-2012, 10:43 AM
Very nice detail Paul. Hope to be able to try it with my data when time allows.
I'm fairly sure we're not going to get truly amazing detail in the corona because these shots are taken at 14degrees altitude in a moist environment - no self respecting imager would try to shoot a masterpiece under such conditions!
DT
Paul Haese
25-11-2012, 02:32 PM
Mike, getting the extended corona was my aim for this trip. Next one will be diamond ring and wide field. It was an epic trip for us with over 8000km driven during the last 3.5 weeks.
Rick I was not intending to do that but every time I thought it looked right I would see another tip else where which would further enhance my image.
Greg I will go hunting around, that would be nice to get the moon detail.
David that was my thoughts all along. I noticed during shooting the frames that the seeing was pretty ordinary and I put this down not only to the elevation but the presence of the clouds and the associated moist air surrounding the clouds. Another eclipse I feel.
Quark
25-11-2012, 05:16 PM
Very nice result Paul, certainly worth the trip to end up with a record such as this.
Regards
Trevor
seeker372011
25-11-2012, 08:49 PM
I like this final version
ComsatAngel
25-11-2012, 09:09 PM
epic!
Phil Hart
25-11-2012, 11:25 PM
Nice effort Paul. This is time consuming and difficult processing so you've done very well I think, especially given less than ideal conditions cloud-wise.
Were you following the instructions on this page (adapted for newer version of Fitswork)?:
http://www.gva-hamburg.de/sofi2006/fitswork/sofi_fitswork_uk.htm
What settings for the radius/rotation angle of the filter did you end up using? Did you get an ugly black circle inside the corona and then just black out the whole moon?
Phil
Paul Haese
25-11-2012, 11:52 PM
Thanks all for the comments.
Phil, yes I followed the somewhat vague instructions on that page. I think the menus are different now to the tutorial. I used an angle of 1.5 and 2 radius. I did not get a ring but the moon does move in the process of imaging this event. So I had to use a slightly larger moon and mask that over the top.
Hope that helps. :)
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