I wish that I had discovered your videos on Pixinsight, months ago and not just in the past 24 hours. Your videos are absolutely wonderful, with excellent information, clarity and delivered with great communication skill and at the right pace. Absolute magic, thank you.
Hi Sascha, I just wanted to let you know that I have watched many GHS, RU-vid videos to try and gain a better understanding of how to use the tool. I found your video very enlightening, easy to understand, and I really learned a lot from it. It wasn’t really clear to me how to use the intensity tool until I saw your video. The nine, five, and three settings work very well. Thanks for the instruction. Keep up the good work!
Phenomenal - thank you so much for this clear explanation. Also, your joke about RC astro releasing "Stretch Xterminator" was hysterical - as a huge fan of his products, I hope your comment was a prediction
My success with this tool has been limited ever since it came out as a script. I have about a 50% success rate getting something I like. I have watched every tutorial I can find on GHS ever since, but yours is the first that really helped--all in less than 15 minutes! Thank you for the clear tutorial.
Excellent video Sasha. Also thank you for always providing extra content and help to me as a Patreon supporter. I am very happy with my membership on your Patreon. The access to files is a huge benefit to me.
the first time ive managed ghs ..the best video i found to follow, did an up close of m45 but may try it again and seperate stars from nebula image before ghs , as you say trial and error thank you
Great tutorial as always. I have an audio related feedback for you. It seems that you record your voice with a stereo microphone. For voiceovers, this is kind of distracting, especially on headphones if the voice is not centered and moving around from left to right. My suggestion is to convert the stereo audio channel to mono. Premiere Pro: Right Click on Modify > Audio Channels > Clip Channel Format > Mono In Final Cut: Click on the Audio Clip in Inspector and select the Stereo Dropdown and select Dual Mono iMovie does not have an inbuilt option, but exporting the audio in audacity as mono should do the trick.
@@viewintospace if you need any help with this process let me know. You can also visually check if everything worked if the left and right channel in the audio meter are exactly the same level all the time.
@@olaftopper4813 Da müsste aber mal das wbbp Benutzerfreundlicher werden. Damit kann ich mich nicht anfreunden und ich habe auch nicht gecheckt wie man FlatDarks hinzufügen kann. 🤔
@@DanielNimmervoll Die FlatDarks werden einfach zu den Darks hinzugefügt. Wbpp erkennt dann selber anhand der Aufnahmezeit was mit was kalibriert werden muss.
@@svenboljesic Das funktioniert bei mir leider nicht. Wenn ich die FlatsDarks Ordner hinzufüge werden diese als Flats geladen. Vielleicht müsste ich im Dateinamen noch irgendwo das Wort "Darks" drin haben.
@@DanielNimmervoll Mhhh ok. Also habe es gerade ausprobiert. Ich kann sogar Flats in die Darks laden. Wenn sich das Fenster wbpp öffnet gehst du auf den Reiter Darks. Dann kannst du unten am Fenster "+Darks" auswählen und so die FlatDarks hinzufügen.
I kind of agree. Funny enough once the process was introduced the Script started crashing on my computer, so I was kind of forced to make the change. But I also see no benefit of the process vs. the script.
This is a GREAT video !! It has really helped me to stretch my images much better. Can I ask a question? .... what method did you use to remove the stars from you initial linear image?
Nice job Sascha. Just to clear something up though, both the STF and HT are nonlinear stretches not linear (well they can be linear if you only adjust shadows and highlights sliders), harmonic to be exact, although if I recall they also does one or two other things in the background as well. You can emulate HT by just leaving the symmetry point 0, local intensity at 1 and then just using the stretch factor slider.
I've been wrestling with GHS for about a week now, and I'm largely giving up - for me it's just too difficult to achieve consistently good results on dim targets. For nice bright emission nebulae; great - but for dark nebulae or feint dust clouds it's just a headache. For those targets I have much better results just using autostretch and then adjusting curves. But in a more general sense I jus't don't really see how GHS produces qualitatively better results than autostretch + curves. More control; yes - but better quality? I'm not convinced. What do you think?
Great Tutorial. I have a question. I have been using the EZ soft stretch prior to channel combination and when I try to do the combination before stretching so I can run StarXterminator my combination is completely green. I've tried another pass of ABE set to subtraction and it helps a little but everything is still green. SCNR also helps a little but not enough to get a color balanced starless image to run GHS. Wat am I missing?
Try after the channel combination to open the STF process and do an unlinked autostretch (click the chain icon and then the nuclear icon). That might so the trick.
I recommend this as the default stretch for everything. With the exception of RGB stars, where I recommend first a slight stretch with ArcSinh (to accentuate the star colors), and then finish stretching with GHS.
Yes, by alll means! On one side it give the better results of the star removal when doing it in linear, and on the other side it gives the better results of stretching stars separately, and also with the help on ArcSinh Stretch. Have a look here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-uw_88wD2NWM.html
Thank you for this. So when you do GHS you do it on a combined colour image, rather than on the individual channels? I have been doing it on the channels, then making sure they have relatively similar histograms, then I combine them. It's a bit more work, so if it's not really necessary, it would surely simplify my routine a bit.
Before BXT you had both options - and both have their pros and cons, but at least when you use BXT you have to stretch the combined image as BXT should be applied to a color image before stretching.
