GHSv2 vid1v1

Introducing v2 of the Generalised Hyperbolic Stretch (GHS) script by Mike Cranfield for Pixinsight users. Stretching is used to convert linear astronomical images into non-linear form so that we can actually see and enjoy them. This script shows how the inputs are used to control the shape of the stretching transform function and its impact on an image. GHS stretching is a precise, mathematically rigorous method of stretching images that generates, in my opinion, the best and most pleasing results. GHS avoids star bloat, displays very dim nebulosity/features in images easily and provides the greatest control of contrast placement.
Mike has created a fantastic environment in which to apply the hyperbolic stretch transforms, with many features that are described in these follow-up videos, as well as other videos hosted on the ghsastro.co.uk website. You can obtain the script from this website, and can easily install it into Pixinsight. Mike and I think this is an excellent addition to your image processing tool kit - and it's free.

[@davidpayne8646]

Thanks Rick, Tensorhugh, and Mark.

[@hermannfernandespais7317]

Amazing script and video. Thank you so much

[@davidpayne8646]

Thanks Hermann. Glad you found it helpful.

[@desmcmorrow2978]

Excellent video. Clear and to the point. Will incorporate in my workflow from now on. Cheers, Des

[@davidpayne8646]

Thanks Des, Mike's work on v2 makes it seemlessly integrate with mine too.

[@robertbates4892]

Excellent video. Your explanations are clear. Thanks so much!

[@davidpayne8646]

Thanks Robert

[@tensorhugh2588]

Thank you David for this tutorial! I recently discovered GHS [and how powerful it is].

[@rickbria8420]

David, thank you so much for this video. It’s very helpful in learning this fantastic script. I’m almost there, and eagerly awaiting your future videos. Thanks again.

[@dalep2842]

Great stuff Dave! thanks for the heads up on AB and I look forward to your next video on this script!

[@davidpayne8646]

Thanks for the feedback, Dale. A couple more to make.

[@markmuratore413]

Great video. Thank you

[@davidpayne8646]

Thanks Mark

[@MichaelBorland1]

Extremely useful tutorial. My only suggestion for improvement is to control the background noise (computer fans?).

[@davidpayne8646]

Yes, my apologies. I will replace and update when time permits. Please visit ghsastro.co.uk for more recent ones with better sound quality.

[@NckBrktt]

This is also available in the latest version of Siril (1.1.0 and above). The graphical interface is very similar to the one shown here in Pixinsight.

[@davidpayne8646]

Thanks, Siril is great. The Siril guys (Cyril and Adrianne) were kind enough to involve us with its development.

[@osamadessouky802]

Thank you David for the excellent video. Trying to get my head around GHS!
As a side note, I think your mic is placed very close to your laptop’s vents, or close to your PC.
I’m watching the video whilst wearing headphones, and there is a very distracting fan noise/whine that goes up and down whenever your are doing any CPU intensive tasks.
Thanks again
Ossi

[@davidpayne8646]

My apologies - this was my first video... I will replace this one when time permits

[@boswix6209]

I happened to stumble across this video and installed the repository link for GHS. Although I have only had a couple of days to try, I will be using it now on in my processing routine. Many thanks for your team in developing this script. I have one suggestion and I am unsure if it is feasible or not. My suggestion is to reverse "created new image" and have that be the default with a perhaps a generic Image ID "Stretched." The toggle could be for those that would prefer not to create a new image. Nice to compare between the two and of course, 80% of the time I forget to check the box and assign a name. Just an idea... Thanks again!

[@davidpayne8646]

Hi Boswix. Glad you like. Your idea is a good one, but I think the script does put in a generic name if you leave the input blank. If the name exists already, it puts in a number at the end.

Great tutorial David. Can't wait to see the rest, especially Col stretching. Just one thing, I think your microphone is catching fan rotation and you have a buzzing sound through entire video.

[@davidpayne8646]

Yes, that is indeed what is going on. My apologies. (you might be able to tell that creating you-tube videos is a little bit out of my box) Should be fixed goint forward, and I may come back and re-record.
Glad you enjoyed and it was helpful though.

@@davidpayne8646 If you want, you can send me the video file and I can clean the buzz sound and send it back to you. There is no need to re-record it again. Second video is great and I think you are already getting the hang of it. This GHS is a game changer for me so your videos are really helpful.

[@davidpayne8646]

@ Sounds like a great idea. Tell me how, and I'll take you up on it.

[@weshandrow2011]

Will not install the update, one thing I am not certain of how to do is removing version 1. The website assumes that everyone knows how to do this.

[@davidpayne8646]

I asked Mike for the best way to uninstall v1. I'll post again when I find out myself - I think I simply deleted it.

[@albertodonzelli1562]

I absolutely agree :-) No intuitive way to remove it, no info on that nowhere.