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questions about shg images and clouds
Posted: Sat Nov 12, 2016 7:00 pm
by highfnum
did attempt today and clouds spoiled image a bit
but it did raise some questions
1) can cloud images be removed with post processing techniques
2) people report that looking at sun thru thin clouds increases surface contrast . it looks like i got that effect on this images near one of proms. Is that true?
- cloudshashg.jpg (87.4 KiB) Viewed 3437 times
Re: questions about shg images and clouds
Posted: Sat Nov 12, 2016 9:35 pm
by highfnum
this may be easier to see cloud effect on filament
- fc2_save_2016-11-12-122926-0000ha_000.jpg (111.38 KiB) Viewed 3428 times
Re: questions about shg images and clouds
Posted: Sun Nov 13, 2016 2:52 pm
by Montana
Pity the clouds were right on the most interesting part, never mind at least you got to see the sun
Alexandra
Re: questions about shg images and clouds
Posted: Sun Nov 13, 2016 8:24 pm
by Merlin66
John,
Good images notwithstanding the weather.
Unfortunately I don't know of any way of removing the cloud from the image.....
Re: questions about shg images and clouds
Posted: Mon Nov 14, 2016 4:50 am
by Spectral Joe
There is some hope, if the continuum near the Ha line (or whichever line you are using at the time) is not saturated. If you synthesize an image using the continuum and use this as a flat it should correct some (most) of this. It will cause the dynamic range in the affected areas to be reduced, though. Thus is the problem with any post processing, if the image data has a problem and you fix it with math there is always a price to pay.
As for enhanced contrast through clouds, it's an optical illusion related to the eye's response, not a real effect.