Alex Posted December 13, 2020 Share Posted December 13, 2020 My latest attempt at processing the Soul Nebula. This is my second narrowband image and really struggling to process it. I am currently using PixInsight and might even have to resort to reading the manual !!!! 3 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 13, 2020 Share Posted December 13, 2020 Posted by: @Alex This is my second narrowband image and really struggling to process it. I am currently using PixInsight and might even have to resort to reading the manual !!!!The image is coming along great. I believe it is just a case of fine tuning on the curves adjustment. The background on this particular nebula is not as dark as most, it is full of nebulosity. I think your background is too dark, and you are removing detail. On my image of this target, the background reading is around 0.1/0.15, I think yours is much lower. Also I think your stars are blown. To compensate against blown stars, and allow you to adjust the image better, use this adjustment in histogram transformation. It can be applied anytime you are getting close to 1.0 on the brightness level. The default is 1.0, adjust to 1.1. Quote Link to comment Share on other sites More sharing options...
Alex Posted December 13, 2020 Author Share Posted December 13, 2020 Posted by: @AstronomyUkraine Posted by: @Alex This is my second narrowband image and really struggling to process it. I am currently using PixInsight and might even have to resort to reading the manual !!!!The image is coming along great. I believe it is just a case of fine tuning on the curves adjustment. The background on this particular nebula is not as dark as most, it is full of nebulosity. I think your background is too dark, and you are removing detail. On my image of this target, the background reading is around 0.1/0.15, I think yours is much lower. Also I think your stars are blown. To compensate against blown stars, and allow you to adjust the image better, use this adjustment in histogram transformation. It can be applied anytime you are getting close to 1.0 on the brightness level. The default is 1.0, adjust to 1.1.Thanks for the tips :-) I have the nebulosity in the raw data and am definitely clipping the blacks and losing detail. I will try again :-) Do you have a link to your image? Would be interesting to compareCheersAlex 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 13, 2020 Share Posted December 13, 2020 Posted by: @Alex Do you have a link to your image? Would be interesting to compareCheersThis is my version of the Soul Nebula. 1 Quote Link to comment Share on other sites More sharing options...
Alex Posted December 13, 2020 Author Share Posted December 13, 2020 Posted by: @AstronomyUkraine Posted by: @Alex Do you have a link to your image? Would be interesting to compareCheersThis is my version of the Soul Nebula.ThanksI think you were talking about the nebulosity in the top right of your image? I have that in the raw data just struggling to combine the channels without ending up with a horrible colour cast over the whole image. I think my problem is matching each channel, I have been using the masked stretch and Linear fit Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 13, 2020 Share Posted December 13, 2020 Posted by: @Alex I think you were talking about the nebulosity in the top right of your image?I have that in the raw data just struggling to combine the channels without ending up with a horrible colour cast over the whole image. I think my problem is matching each channel, I have been using the masked stretch and Linear fitYes that bit is more pronounced in mine. Do you have a link to your stacked images. I would like to see if there is any problems with them? Quote Link to comment Share on other sites More sharing options...
Alex Posted December 13, 2020 Author Share Posted December 13, 2020 Posted by: @AstronomyUkraine Posted by: @Alex I think you were talking about the nebulosity in the top right of your image?I have that in the raw data just struggling to combine the channels without ending up with a horrible colour cast over the whole image. I think my problem is matching each channel, I have been using the masked stretch and Linear fitYes that bit is more pronounced in mine. Do you have a link to your stacked images. I would like to see if there is any problems with them?I have sent you a message with links to the stacked images Thanks Alex Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 13, 2020 Share Posted December 13, 2020 Posted by: @Alex I have sent you a message with links to the stacked imagesOK I just downloaded the raw data. I will post the result when I finish it. Thanks. Quote Link to comment Share on other sites More sharing options...
Alex Posted December 13, 2020 Author Share Posted December 13, 2020 Posted by: @AstronomyUkraine Posted by: @Alex I have sent you a message with links to the stacked imagesOK I just downloaded the raw data. I will post the result when I finish it. Thanks.Thanks, Really appreciate you having a look at them Alex Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 13, 2020 Share Posted December 13, 2020 Posted by: @Alex I have sent you a message with links to the stacked imagesHere is my version of your image. I will list the processes I used.Dynamic cropDBELinear fit using the Ha stack as referenceCombined the channels into an SHO using Channel CombinationColor calibration, just using a preview for the dark reference, no white referenceBackground NeutralizationStretched the image using ArcsinhStretch with a stretch factor of 35, followed by Histogram transformationUsed Starnet, checking the create star mask box.Renamed the star mask as RGB starsAfter stretching the nebula had a green cast, and the background had a magenta cast. I inverted the image and applied SCNR to remove the magenta, then inverted the image back, and applied SCNR again to remove the green cast.I worked on the starless image, with curves, using masks to work on the nebula and background. Renamed it SHOUsed TGVDenoise on the starless imageI used the original Ha as a Lum layer. I removed the noise with MultiScaleLinearTransform, then stretched the image as before. Removed the stars using starnet. I tweaked the starless LUM in curves, sharpened it slightly, then combined with the SHO image using LRGBCombination.Final process was adding the RGB stars extracted from SHO image. I used PixelMath to combine the SHO and RGB stars.The data is excellent, just need to hone your processing skills a little. 1 Quote Link to comment Share on other sites More sharing options...
Alex Posted December 14, 2020 Author Share Posted December 14, 2020 Fantastic :-)Thanks for looking at that - I will try your workflow and see how that goes Alex Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 14, 2020 Share Posted December 14, 2020 Posted by: @Alex Thanks for looking at that - I will try your workflow and see how that goesLooking forward to seeing your result.I normally use PhotometricColorCalibration but I didn't know your focal length or pixel size. It might give your stars better colour than the normal ColorCalibration. Quote Link to comment Share on other sites More sharing options...
MarkAR Posted December 15, 2020 Share Posted December 15, 2020 Data looks really good to me, just a few tweaks needed in processing to get the best out of it. 1 Quote Link to comment Share on other sites More sharing options...
Alex Posted December 26, 2020 Author Share Posted December 26, 2020 Posted by: @AstronomyUkraine Posted by: @Alex Thanks for looking at that - I will try your workflow and see how that goesLooking forward to seeing your result.I normally use PhotometricColorCalibration but I didn't know your focal length or pixel size. It might give your stars better colour than the normal ColorCalibration.Finally had chance to have a play with the data. Following some great help from you its beginning to look a lot better I think. 2 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 27, 2020 Share Posted December 27, 2020 Posted by: @Alex Finally had chance to have a play with the data. Following some great help from you its beginning to look a lot better I think. Yeah, looking really good now, it's a big improvement on your original. You have more detail in the nebula, without over stretching it. Your stars have a green tinge to them, but that should be easy to rectify in curves. If you want to give the nebula a bit more punch, try using the DarkStructureEnhance script, it will give a bit more definition to the dark dust lanes. Another good tool for enhancing detail is the HDRMultiScaleTransform, the default settings are usually fine, but experiment between 5 and 8 layers, to see which gives the best result. Quote Link to comment Share on other sites More sharing options...
Gina Posted December 27, 2020 Share Posted December 27, 2020 Very nice! ? 1 Quote Link to comment Share on other sites More sharing options...
Alex Posted December 27, 2020 Author Share Posted December 27, 2020 Posted by: @Gina Very nice! ? Thanks Gina :-) Quote Link to comment Share on other sites More sharing options...
Astroarg Posted December 27, 2020 Share Posted December 27, 2020 @AstronomyUkraine I aim for a soul like this.. I love the colours.. those blues.. drool. 1 Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 27, 2020 Share Posted December 27, 2020 Posted by: @Astroarg I aim for a soul like this.. I love the colours.. those blues.. drool.ColorMask is your friend if you use PI. You can isolate the blue, and work on it. Quote Link to comment Share on other sites More sharing options...
Alex Posted December 27, 2020 Author Share Posted December 27, 2020 Posted by: @AstronomyUkraine Posted by: @Alex Finally had chance to have a play with the data. Following some great help from you its beginning to look a lot better I think. Yeah, looking really good now, it's a big improvement on your original. You have more detail in the nebula, without over stretching it. Your stars have a green tinge to them, but that should be easy to rectify in curves. If you want to give the nebula a bit more punch, try using the DarkStructureEnhance script, it will give a bit more definition to the dark dust lanes. Another good tool for enhancing detail is the HDRMultiScaleTransform, the default settings are usually fine, but experiment between 5 and 8 layers, to see which gives the best result.Thanks :-) I noticed the green tinge on the stars and removed it after I uploaded the image ! Really getting to like PI now 1 Quote Link to comment Share on other sites More sharing options...
Jkulin Posted December 27, 2020 Share Posted December 27, 2020 Posted by: @AstronomyUkraine DarkStructureEnhance scriptJust had a quick look at that Brian and it does a really nice subtle job on the dark stuff, thanks Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted December 28, 2020 Share Posted December 28, 2020 Posted by: @Jkulin Just had a quick look at that Brian and it does a really nice subtle job on the dark stuff, thanksMy pleasure John. I come across it a couple of months ago, after watching a video on youtube. It's one of those little gems hiding in PI, I don't see many imagers using it. 1 Quote Link to comment Share on other sites More sharing options...
Jkulin Posted December 28, 2020 Share Posted December 28, 2020 Yep Brian, I'm finding more and more gems hidden inside the scripts, the HSV one has astounded me ? Quote Link to comment Share on other sites More sharing options...
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