Thread: M83
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Old 27-03-2011, 11:15 PM
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allan gould
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Join Date: May 2005
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Quote:
Originally Posted by [1ponders] View Post
Great detail Allan, I like it a lot.

There does seem to still be some sort of gradient or poor flats reduction that has left a broad dark edge to the left side and a ring, that is slightly darker than the background, around the galaxy ( sort of like an inverse vignetting)
Paul
Your correct. There is a gradient that I noticed when I was setting the black and white points for the stacked image. I've had a go and can remove this gradient as it was caused by the moon coming up and of course the flats wouldn't have removed that light pollution. I've tried two methods so far and one worked well but I think I will try Iris and see if that is better. I think the ring around the galaxy was caused by isolating it to try and remove the gradient.

Quote:
Originally Posted by strongmanmike View Post
Yes the basics are all there and a great galaxy to image Alan, I agree with Greg, try what he suggest and repost, see if you can deal with the right side gradient too, be interested to see the repro.

Mike
Mike
Will do a Sidonio on it - promise. And I've taken on board all you, Greg and Paul have noticed and will implement it when I get clear skies again.
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