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Three weeks ago, the wife and I traded in our very heavy 9.25in Evolution setup for a much more portable rig. We have been live stacking up until this point but a few nights ago I decided give some post processing a try. I purchased Pixinsight along with the XT plugins after watching a few YT videos and jumped right in. Workflow: WBP script with 30 each of Flats, Darks, and Bias files, and 150x120s Lights PCC ABE SXT Stretched starless and slightly adjusted the saturation. Stretched stars recombined BXT NXT We are both pretty excited with the result, but I'm sure there are a host of things we could have done better. Any and all feedback welcome! https://www.icloud.com/iclouddrive/0ec24KEpKoNvR-3egbAOm6fiA#masterLight_BIN-1_6248x4176_EXPOSURE-120 https://astrob.in/mu1s91/0/ |
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| I think you forgot to link or attach the image. 😃 |
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Salvatore Iovene: indeed  |
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| I guess you need to check your lens as the field coma is pretty significant and you might need a field flattener/corrector for the sensor you're using. And avoid all this *XT kerfuffle for the moment being. Keep it simple and keep it nice. Just HT and Curves to get started. Bump up saturation as the picture is nearly color-free. And remove the gradients, too. |
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andrea tasselli: Thanks for the input! I took some of your advised and uploaded a new revision: https://astrob.in/mu1s91/B/ |
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| Not bad for 3 weeks in. Keep it up. Check out Masters of PixInsight. You'll learn more in one day than you will with months YouTube videos that contradict each other. |
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It would have been nice to see a cropped version of your file to get a good look at the galaxy details....but that aside, a couple of comments/suggestions that hopefully you'll find useful: 1. You might want to do a background neutralize before you do color calibration... 2. learn to use SPCC over PCC, 3. Almost never do ABE (except in very uniform fields); always prefer DBE instead. ABE will create dark halos around galaxies and globulars that you'll struggle to get rid of except by darking the whole background too much.... 4. You'll want to use SCNR (degreen) as one of the last things in non-linear processing for OSC, especially for galaxies and clusters; not so much for nebula. 5. You (and others) will like your images better if you spend time framing the subject (by dynamic crop) before you're done. Best wishes, and good luck in the learning curve..... DougS. |
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That is a fantastic first image. Your workflow is a bit out of order IMHO, Stack Crop DBE or GraXpert BXT SPCC SXT or Starnet2 then stretch, curves, saturation etc. NXT (I still haven’t figured out if it’s better here or in linear or both) Recombine. This being said, I know that there are 5 ways to do any one thing in PI and I’ve seen very accomplished editors totally move this order around. But I am sure that BXT works best on linear data, before any colour correction or noise reduction. |
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| @Joe Linington this is pretty much my same workflow except adding in the RGB combo early on. I've been doing EZdenoise near the last step. Seems to work well there |
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I remember it well , you have just fallen down a rabbit hole. Hope you learn quickly. Can`t see theimage though. Good Luck Roger |
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| If this is what you are producing 3 weeks into this hobby, you're gonna pick it up pretty fast. |
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Joe Linington: I looked into this a while back, and the last thing I read was suggesting to do BXT after SPCC, but before Historgramtransformation or any stretching. Here is a comment from the creator of BXT. Please correct me if there is new info out there. https://pixinsight.com/forum/index.php?threads/spcc-after-blurxterminator.19928/post-121205 |
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I looked into this a while back, and the last thing I read was suggesting to do BXT after SPCC, but before Historgramtransformation or any stretching. Here is a comment from the creator of BXT. Please correct me if there is new info out there. All manners of color calibration, not just SPCC, should really be applied before deconvolution. |
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andrea tasselli:I looked into this a while back, and the last thing I read was suggesting to do BXT after SPCC, but before Historgramtransformation or any stretching. Here is a comment from the creator of BXT. Please correct me if there is new info out there. I was referencing the recent discussion between Russell Crowman and Adam Block on Youtube (Adam Block's Channel) where they discuss this topic specifically and recommend the opposite of above. So confused now. |
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Joe Linington: BXT can change the shape of the stars, which will affect SPCC. Just look at the correction stats before and after BXT, you'll see. I still kinda despise what it does to stars, especially on RGB data (vice OSC) if your guiding wasn't perfect on each channel. I haven't watched any of the tutorials on it, just trial and error, paying close attention to how it affects the data. |
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| The SPCC graphs (scatter plots) in https://pixinsight.com/forum/index.php?threads/spcc-after-blurxterminator.19928/#post-121218 says it all: SPCC will have to estimate the color calibration parameters from noisier data if deconvolution or blurX precedes SPCC. While PI uses a robust fitting procedure for parameter estimation, as always, the noisier the data, the more uncertainty the estimates will carry. That's why someone may be satisfied from SPCC after blurX (or deconvolution). The SPCC estimates may be closer to what the """correct colors""" are for the specific user, while actually being inaccurate (in the SPCC sense). |
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Joe Linington:andrea tasselli:I looked into this a while back, and the last thing I read was suggesting to do BXT after SPCC, but before Historgramtransformation or any stretching. Here is a comment from the creator of BXT. Please correct me if there is new info out there. I went back and re-watched the video with Adam Block and Russell Crowman and I was very wrong (thanks for pointing that out so I could stop that mistake). Colour correction is before BXT and when I run my own test, what a difference. Changing just that solved an issue I was having. Luckily I have only done 2 images completely with BXT so not much re-work to do. |
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Thanks all for the feedback. I took a fresh set of data last night and just finished up processing it. I tried to incorporate as much of your suggestions as possible.  |
