Image of the day

Captured by
Douglas Rollain

M20 Trifid Nebula in LRGBHa

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Started by lleege, 08/15/2009 01:27PM
Posted 08/15/2009 01:27PM Opening Post
What's wrong with this?
http://tinyurl.com/nrj7j4
Posted 08/15/2009 02:04PM #1
It has a light pollution gradient and some color noise.
Without the gradient:


Attached Image:

dan  kowall's attachment for post 132035
Posted 08/15/2009 04:28PM #2
Extreme stretching will bring out gradient in the image. Some water vapor in the air will cause brightening around bright stars. You've seen this on nights when the Moon is full and surrounded by bright sky background that fades away with distance from the Moon.

Rolando