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Description: Based on some feedback, the blue in the spiral arms from hot, young stars was muted and I adjusted the histogram to bring it up. My thanks to those who gave me this advice. I feel this is much closer to the mark.
Uploaded: ...
Description: Ha image
Uploaded: ...
Title: NGC 253 reworked
Description:
The benefit of cloudy skies, is the time to go back and relook at data/ images that you've been wanting to do for a while. NGC 253 was my second deep sky image taken with my C14 EdgeHD and the SBIG 16803. Finally I had overcome the myriad of technical issues I had run into.
However, having overcome the "engineering" issues, I then set about processing the data, without the benefit of much dso image processing experience. I think I did a fair job, given that but I was never rally happy with it.
Previously I integrated the Ha and RGB at the linear stage and I had to do a lot of work with masks etc to avoid noise from the Ha image giving the background a horrible red hue. These days I do it at the non-linear stage and that is far easier and creates a minimum of problems. Getting the stretch on the Ha image right before integration is very important and I made a number of iterations on that.
As I processed this, the blue colour of the spiral arms and the yellow/ gold colour at the galaxy's centre came through beautifully. I had lost the blue or taken it down too much in the original version. There is a great deal of subjectivity on the intensity of a galaxy's colour in an astro-image, but I think the consensus seems to sit with a deeper, more intense colour saturation image and I think this is closer to that mark. I hope you agree. It certainly makes the image, at least to my eye, more aesthetically pleasing.
I chose this orientation as it is easier on the brain.
Uploaded: ...
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Status | Advanced success |
Started | ... |
Astrometry.net job | 4070585 |
PixInsight job | YVQY05GC63PN8OVRXYVL980PL5PSUQMW |
PixInsight queue size | n/a |
PixInsight stage | n/a |
RA (center) | 00h47m37s.233 |
RA (top/left) | 00h46m42s.606 |
RA (top/right) | 00h46m23s.379 |
RA (bottom/right) | 00h48m31s.990 |
RA (bottom/left) | 00h48m50s.743 |
Dec (center) | -25°17′33″.50 |
Dec (top/left) | -25°00′23″.55 |
Dec (top/right) | -25°30′36″.58 |
Dec (bottom/right) | -25°34′39″.99 |
Dec (bottom/left) | -25°04′29″.81 |
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