m11

[alacant]

Hi everyone

45 minutes either side of the meridian at 30ºC ambient and with that darn cls filter still in the camera as this was supposed to be a warm up; we'd estimated it was possible with this FOV to get both m8 and m20 in the same field, but we never got there. maybe tonight. Those awful powder blue stars.There must be a setting to correct that somewhere...

Thanks for looking and clear skies.

canon 700d, ISO800

 

 

[wimvb]

Wow, that's a lot of stars. Have you tried masked stretch in pixinsight (if that's the software you use)? It helps in keeping stars under control.

[alacant]

16 hours ago, wimvb said:

stars under control

Thanks Wim. Yeah, the stars are awful. I removed them and stretched the dust and gas before dropping them back. I think maybe that's what you are describing. Maybe PI does in one that which gimp has to do over several layers...

 

[wimvb]

Masked stretch is a PixInsight method where a normal curve stretch is done in many (100) iterations. After each, a luminance is created that is used as a mask in the next stretch. This way, bright structures such as stars receive less stretch than background nebulae. It's also a good way to keep stars small and colourfull.

The closest you can get in PS and GIMP would be this:

http://adsabs.harvard.edu/full/2012JRASC.106...86M