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Old 05-19-2015, 06:07 PM
Geomak Geomak is offline
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Default Unknown Artefacts

Hi GStarEx users,
My last post mentioned that I would try my hand at
planetary imaging using the GStar Ex2 camera, which
I have done ( see attached ).
After using the wavelets function in Registax 6.0, I seem
to be getting some unwanted artifacts after processing
the images, some can just be seen in the Venus pic.
( from the terminator toward the brighter left hand side ),
but is more evident in the Jupiter image ( circumference area ).
The wavelets operation was used sparingly on both images ( 15-20 ),
as the higher the number, the worse the artifacts became.
This limits the amount that the wavelets function can be used,
which is a shame because more detail can be squeezed out if
one goes with a higher number
Can anyone tell me what these artifacts are and what are the
causes, but most importantly how does one go about negating
or eliminating them altogether.
Any suggestions would be most welcome.
Cheers
George
Attached Images
File Type: jpg Venus.jpg (28.8 KB, 13 views)
File Type: jpg Jupiter.jpg (33.4 KB, 18 views)
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  #2  
Old 05-20-2015, 12:01 PM
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dynamo dynamo is offline
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Default

i tend to get the rings inside jupiter's circumference but have never seen a background like that.
strange for sure.
maybe try AS!2 instead for stacking then registax for wavelets???

http://www.autostakkert.com/
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Cheers and clear skies,
George.
CGEM DX 1100 HD | 80 x 600 Guide Scope w/NexGuide Autoguider | NexStar SLT130 | Bushnell 9 - 27 x 50 mm Binoculars | Mallencam XTREME Colour CCD Camera | many 2" TeleVue Ethos EP's & Celestron 1-1/4" Filter & EP Kit | Universal Camera Mount | Lunt 80 mm DS2 | eagerly learning how to use all of this
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  #3  
Old 05-22-2015, 12:43 AM
Geomak Geomak is offline
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Default Unknown Artefacts

Hi George,
Good to meet another George. By the way, what a great name, don't you think?.
I have a suspicion it is not in the way Registax operates, because on close
examination of the planet Saturn on the computer monitor there is a faint trace
of several bands on the planets disk which are accentuated when processing the
image, however I shall give Autostekkert a try and see what happens.
Attached is a pic. of Saturn with processing done in Registax with very little use of
the wavelets function. A closer look at the disk of the planet you should see the faint
circular artefacts that soon became apparent as I processed the image.
Were you able to remove these artefacts in your Jupiter Images?.
Cheers
George
Attached Images
File Type: jpg Saturn.jpg (3.5 KB, 12 views)
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  #4  
Old 06-06-2015, 12:03 AM
Geomak Geomak is offline
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Default Strange Artefacts



Hi GStarEx users,
Further to my first post in regards to the unknown
artefacts in my Jupiter image.
I contacted Steve at My Astro Shop in Queensland
Australia who sells the cameras, and was relieved
to find out that it's not a problem in the camera.
It turns out that it is caused by selecting poor quality
frames for the stacking process, particularly those
that suffer from bad seeing.
What's seen in the Jupiter image ( see my first post )
is known as an onion ring gradient, which is an apt name.
So it seems that I need to be a little more choosy in regards
to the quality of frames that I need to select for stacking.
As I am only a beginner in this area, it is a lesson well learned.
Well, it's back to more practice for now, especially if the
seeing permits.
Cheers
George
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