Lum+SHO Rosette Nebula Comments an Critiques - Forums

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IOTD Staff

Jan 8, 2022

Okay, maybe I am just a glutton for punishment, but I would love to get feedback on this image. I really apperciated the feed back on my Heart and Soul SHO 135 mm project.

This image is with my RASA8 using SHO data from 1 nigh in 2020 with my ASI 1600MM at 3.76 um and then adding luminance data at 2.3 um with my ASi 294 MM to slightly upscale the image in 2021.

Here is the full screen image: https://www.astrobin.com/full/6woatm/C/

Here is another version with successive crops of the image to so the resolution: https://www.astrobin.com/full/zfdv8r/H/

Thanks in Advance and Clear Skies! - Brandon

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badgie

Jan 8, 2022

Fantastic shot! I have a couple personal opinions: I would increase your contrast at the bottom of the histogram to bring out the dark structure and lower the background level. Perhaps stretch your LUM a little more aggressively and smooth your color channels. There is also some noise in the blue channel, particularly evident outside of the nebula itself that is a bit distracting for me so I would push that a little lower. It is possible that this is a scaling artifact when you added the LUM channel?

I'm also looking forward to see what others have to say!

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John Favalessa

Jan 8, 2022

Brandon, in my inexperience I don't see anything to punish you about in this image. I looked around at full resolution…all good to my eye. Personally, I might do a bit of dark structure enhancement, but that's subjective. I'll be curious to see what experience eyes see.

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Christian Vulpescu

Jan 8, 2022 · Edited: Jan 8, 2022

Very nice picture. Congratulations.
My though would be to mask the highlights (e.g. Rangeselection in Pixinsight) and reduce the intensity of the blue channel in the backround. To my eyes the cosmos looks slightly blueish.
As the gentlemen above said, the "Dark structure enhance " script in PI world be a good idea.
Usually I would try to sharpen the areas with the best SNR but I think in this case the best SNR is not good enough not to make it look noisy.
Maybe you could sharpen the luminance a little bit more before you combine it with the SHO color image.
The idea is allways to combine a sharp luminance, which has the best SNR, with a smooth color image. This is the same with brought band images.
But as I said, I like your picture a lot.

CS,

Christian

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Uwe Deutermann

Jan 8, 2022

Can only agree with comments above. One real no no for me is the cosmic background … it is not blue. With some masking and black point assignment this should be an "easy" task to neutralize this. The noise level of the background is also pretty high, maybe TGV denoise again? Kind of blotchy too, always hate it when I look at my images showing the same, not easy to get rid of that. A little sharpening would also give this image a little kick. As well as RGB stars, which I am more and more a fan of. Again … a very pleasant image, and the critic is more picking on details.

John Favalessa

Jan 8, 2022

Christian and Uwe, I appreciate your experienced comments. I now see the issues you both describe. This is a good learning process for me. -john

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Brandon Tackett

Topic starter

IOTD Staff

Jan 8, 2022

Uwe and Christian

Thank you both for you incredibly helpful encouraging comments and excellent critiques. I have looked at this image too often and forgot that I had purposefully made the background for blue for an affect. I fixed both the blue background hue and used Uwe's denoise method to great effects. I attempted different dark enhancements, but never like the results. I will continue on this more. Below is my updated image. Thanks again for the great community that we have in this hobby and providing others to improve my/our craft. CS! -Brandon

https://www.astrobin.com/6woatm/D/

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