Here is the link to my imageL https://astrob.in/8q08b4/B/Pixinsight Workflow: WBPP with 2X drizzle Dynamic Crop GraXpert background extraction Spectrophotographic Color Calibration BlurX Integer Resample NoiseX Statistical Stretch StarX Narrowband Normalization Curves ColorMask mod with convolution Curves using above mask SCNR PixelMath to replace stars Star Reduction Minor tweaks in Photoshop This is my first DSO image that I captured and processed. I learned what little I know about Pixinsight during the processing as I went back and forth from Youtube videos. Thank you for any comments/critique - Tom
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That is a very good image for your first try. Nice job. Just keep learning and working on it.
Michael
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Very nice image. It leans a little too much towards purples for my tastes but that’s me. The focus is sharp but the stars seem a little bloated or like the filter has created a halo issue. Not sure but perhaps SETI Astro’s Halo B Gone could help.
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Thank you Michael and GiffS for your comments. GiffS, I had not noticed the issue with the stars, but I agree and will try Seti Astro Halo B Gone. I also agree that the color looks too purple. I should be able to fix that. At some point I will have a new version of this to upload.
I am also thinking that this image lacks a certain richness that I have seen on some other images of the Rosette. Possibly more data would help?
Tom
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That is an excellent result, especially since it's your first image. Great job!
You did a nice job with the non-stellar part - it's not overly denoised and the color palette is lovely.
One potential thing to improve is background extraction. It's subtle, but for me, it looks like you removed some large-scale signal from the Ha stream structure on the right side of the image. You said you used Graxpert; if you used the AI background extraction I recommend switching to DBE as the AI often mistakes diffuse signal for a gradient, if you did it manually, try being more careful about placing the points near any areas with structures.
For me, the main point of critique would be stars. In my opinion they were reduced too much, leaving a dark halo around them and making them lose most of the color. It's most severe around the edges.
Also, one thing to optimize in your workflow: don't drizzle 2x if you don't have lots of data to support increasing your resolution. It only really makes sense if you have a very high SNR. Especially if you're going to downsample later, then it's not that beneficial at all. 2x drizzle probably also worsened blurx's performance, judging by the drizzle artifacts near the bright stars.
These are all minor tweaks tho, as I said earlier you did a good job with the processing.
Good luck and clear skies!
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Mikolaj,
Thank you for your extremely helpful comments. I was not aware of the potential issues either GraXpert or with drizzling. I will pay attention to both of those things in the next version of this image and for future images. I also agree with you on the star reduction. Thanks again,
Tom
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Tom Fleming:
Thank you Michael and GiffS for your comments. GiffS, I had not noticed the issue with the stars, but I agree and will try Seti Astro Halo B Gone. I also agree that the color looks too purple. I should be able to fix that. At some point I will have a new version of this to upload.
I am also thinking that this image lacks a certain richness that I have seen on some other images of the Rosette. Possibly more data would help?
Tom More data is always a plus. I recently pointed my new set up at the Rosette and got 4 or so hours but I would like to add 8 more good no moon hours to it. Time is running out for that to happen though. What I am trying to do on those few clear, non-windy, nights I have is to shoot the Rosette early before my main target (one I can stay on all night) rises enough to make it worthwhile. That's where having Stellarium customized to show your own backyard is worth all the hassle to set it up. I can make a pretty good plan early on.
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I plan to get more data in a couple of weeks when the sky is darker, then re-process the image. For now, I have reworked it somewhat and uploaded a revised version here: https://astrob.in/8q08b4/C/ |
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Again this is personal preference, the red levels seem to be very prominent in the background. You can bring them down in the Curves adjustment tool by selecting the Red channel and placing a point lower down on the line and adjusting down while leaving the highs where they are or increasing them slightly. Messing around in Curves has sometimes allowed me to get the background tamed and preserve the main subject.
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Thanks GiffS, I will try that with the next iteration.
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OK for this version I went back to the colors that I had used previously. I think the stars and background are better but not perfect. I think I have to correct some sensor tilt, so I am going to look into that. Here is the link for the most recent revision: https://astrob.in/8q08b4/D/ |
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This iteration feels very flat to me, I like your second revision the best it gives a much more 3d effect
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Thanks, Thomas. I agree with you. I like the stars and the background better in the latest version, but I did not quite duplicate the color and contrast of the second revision. I think I will wait until I am able to get more data to add before I revise it again though.
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I think that the data is there to support more depth and color balance. Don’t get me wrong, add data always when you only have a few hours. Spending some more time playing in Curves and color balance could yield the result you want. Did you have a moon issue the night you shot the subs?
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Thanks GiffS. The moon was not a big issue. However, sensor tilt may have affected the stars (mostly corrected with BlurX). Using the ASTAP Image Inspection tool, I learned that my sensor has severe tilt. The camera is a ZWO ASI2600MC and it has a tilt plate attached. I should be able to correct that soon so that my next imaging session is tilt free.
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