M13- using GHS

[umasscrew39]

I finally got around to studying the utility of GHS (vs. 2 other approaches) and I picked a close, bright object to do so- M13, the Great Hercules Cluster. I wanted to see if I could learn how to use it to get a decent image without blowing out the core due to star saturation/bloating. This was taken on a C11" EdgeHD @ f/10 (2800mm) using a ZWO ASI6200MM Pro with LRGB filters under Bortle 7 skies for 4 hours. I was very pleased with the result given my goal. I would imagine many folks would not like this as I think most prefer the bright core which can be more visually pleasing.

M13: Comparing three different stretching methods

An astrophotograph by Bruce Donzanti on AstroBin

astrob.in

 

[umasscrew39]

Here are the same data using MaskedStretch + ArcsinhStretch.

 

[scotty38]

GHS version looks great to me, well done!

 

[John Massey]

Sometimes the acronyms used on this forum are a bit confusing to me. For the lay persons benefit and mine, what is this GHS? The result looks very promising.

 

[pfile]

Generalized Hyperbolic Stretch - https://pixinsight.com/forum/index....ed-hyperbolic-stretching-version-2-1-0.18118/

rob

 

[John Massey]

Thanks Rob.

 

[umasscrew39]

Sometimes the acronyms used on this forum are a bit confusing to me. For the lay persons benefit and mine, what is this GHS? The result looks very promising.

Rob beat me to it...thanks, Rob

John- you may have seen this already, but if not, here is a nice YouTube video by the developers of GHS
(17) GHSv2 vid1v1 - YouTube

 

[John Massey]

Thanks Bruce, the video is a good jumping off place. I've loaded the script and will experiment with it.