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Hi Trick
Clipping is used to enhance features within an image. You provide a threshold level to determine how the clipping occurs. The values above (or below) the threshold level remain the same while the other values are set equal to the level.
In this case clipping can occur trying to get the background as dark as you can to remove such things as LP and make foreground objects stand out
NGC2808 isn' IMO clipped although M4 probably is as their was some severe LP in the top part of the image which I had to work out
hope this makes some sense
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