I'm starting with PI so I've asked on FB group which file should I use after ABE and I've get a recommendation to see this hint. Stunning result! It will be a strong point in my reprocessing workflow, that I'm creating for myself. Thank you for sharing :) And I need to watch all your movies :)
I have been reading and watching videos on how to process an image in Pixinsight for at least 5 months, but to be honest your way always proved to be the most effective way. Thank you very much, the quality of my pictures improved big time!
Many thanks, Shawn - we'll give it go! Your presentation method is so easily digestible, and that, in particular, is appreciated by us older imagers! Cheers!
If you forget to save the process, you can just go to the history on the image after the first run, double click on the DBE entry, and change to "subtraction". This process rock and has been working reliably for me.
Wow! I thought I had seen everyone of your videos but I actually missed this one. Very pity cause this method is brilliant!!! Thank you very much for sharing Shone! You are the best🙂
I am new to PI - just bought software this week and my friend Marty Anderson recommended you. I think you were at Starfest this pas August - I was there also for first time. Thank you for making DBE so simple!
This video is the most useful one that I have seen in a long time (well about two years). It’s a valuable guide to background extraction. It has worked well for me. Thanks for passing it along.
I saw your suggestion to use a very large sample radius in a previous video, and it was a game changer for my DBE results, so a big thank you! I use a radius of 150 to 200 pixels.
Hi Shawn, happy new year and thanks a lot for this old but fantastic video that help me a lot to understand that I was doing wrong with DBE since a lot of time.
Hey Shawn, this past week, in lockdown in Australia, I have been watching so many videos on DBE as I really want to move away from ABE. So you have saved me a lot of pain in trying to understand and get into it with confidence! Cheers John
Worked like a charm! Working on Orion from Bortle class 9 skies and I was in a pickle trying to get rid of the gradient with ABE, and DBE with small boxes. Thank you Shawn!
Brilliant video and tip on DBE. Just had a break from post processing an image in PI and watched this video during a cup of tea. Started the post processing from scratch and much better with these DBE settings so thanks for sharing👍
Excellent video. Works very well. I just tried an image with significant nebulosity from a light polluted area. Did not have any of the strange stuff going on that I normally would.
Great video. Currently using the trial license. Just processed Andrimeda yesterday following your Lpro walk through. Really considering getting a full license.
Hi Shawn, Thanks for much for working this tutorial. Learned a couple of key things: (a) generation - was going crazy adding them manually - (b) the explanation about tolerances - wow, a must a never used it before, and (c) doing "division' followed by subtraction - I will try that. I will check out your channel but love to have you doing snippets like this on the different tools... always hands on like this one though - So GREAT job, and Thanks!
I hope the translator does a good job! This technique is very interesting, but I have a doubt: usually on all tutorials it is recommended that the points of sampling must NOT contain any stars, because the stars create a disturbance that would ruin the DBE's work, and there are a lot of stars here! How do you explain this? Thank
Your videos and tutorials are of great help to me, one question in my PI changing my sample radius to 100 it goes crazy, some number around 20 is equivalent of your 150, am I missing something? greetings from Monterrey, Mexico
Hi Jose - Not sure off hand but one idea may be the sample point size problem could be due to the dimension of your image? Smaller image scale may require using a smaller sample point radius value. I've also found that after inputing the sample radius value and clicking resize all, it also helps to click "generate" as well and it adjusts the sample point box size.
4 года назад
For color images I think you should have done background neutralization first to see the gradient better. Subtracting the background when the green channel is spiked like this can affect SNR on green channel.
4 года назад
My bad, on second view, I see that you applied division before subtracting, it will still affect the SNR of the green channel, just not as much. I think color calibration/background neutralization is a must before background modelization.
So this method only works if you stack within Pixinsight? Loading an image from an outside software like DSS gives a green image where it practically forces you to use ABE first.
Hi .... I have been using your suggestions for doing DBE for some time now and really like the results ... Thanks! However ... I have just upgraded to PI v1.8.8-8 and I find that I can't delete the central grids any more .... the delete key just doesn't do anything :-( I can only add each grid individually. Do you have any suggestions????
I dont dispute that your method here seems to work fine, but I'm still scratching my head because i've just watched like five DBE "howto" videos...and each one is vastly different in the values used, and where to put sample points, which size they are, etc. Really not an intuitive tool to use lol
I tried applying your process to an image of M42 but on the subtraction step, I got an error that DBE couldn't be applied because the instance has less than 3 background samples defined even though I can see and manipulate many more sample areas?
Interesting. Were the sample boxes all (the default) green or were some red? They all need to be green. If they were all green and you still have this problem, best would be to share a download link with me for the master you are trying to apply DBE to. I can look at it on my end and see whats up.
This completely failed for me. Going carefully step by step. First of all, how do you delete a sample square? I had to manually place them around the edges. I started off with a very big gradient using RGB image of M51. Half the sky blue, half the sky green. I have a large city LP source on the green side. After division, you got a fairly nice dark image. I got a fully green image (improvement over 2 tone). When I reapplied the DBE icon, having switched to subtraction, I had strong gradient and also vignetting. An unusable result. I had high hopes for this as I continually fall into the trap of double stretching after DBE, getting blotchy colors all over the image instead of a clean result. I will try it again here, had high hopes for fixing this image. Should I crop the image first? No clue.
After applying the division, I get the black screen with the big red X's around the edge (so far so good), then I close DBE and reset STF (bottom right corner of STF process), then restretch with nuke icon. Right here, I get the splotchy colors all around which people tell me is the result of over stretch. I reapply the DBE icon, switch to substraction, reapply. The yucky blotchy colors again.
That is surprisingly effective. Note that it doesn't matter too much if there are some>/i brighter stars in the sample boxes, as the samples are weighted according to their "quality". Of course, if all the sample down one side are not good, then the DBE will do stuff that you don't want to happen! ;)
