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Need help processing Rosetta Nebula taken with my new ZWO ASI2600MC Pro with an Optolong L-Enhance filter from a Bottle 7 site. The image is an integration of 35, 5-min subs, with darks, flats and bias frames. Its been run through Pixinsight with curve and multiple dynamic background transformations. Nevertheless, I can't seem to make a dent on removing the bluish background gradient. I've even tried removing the gradient from both star and starless images after applying StarXTerminator. Is it hopeless, or is there anything I can try to at least reduce the background artifacts? There's also a redish glow in the central area of the image, which I believe is part of the larger NGC2237 DSO. But I can't seem to bring out any of the nebulosity there either. Any suggestions from experts here are appreciated. https://astrob.in/txgoc8/0/ |
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| Try increasing the Tolerance (in model parameters 1) to at least 2 in DBE. I noticed it works more aggressively. Also make sure to put enough Samples all around the nebulosity. |
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| Glenn, I downloaded your JPEG file and cropped it using DynamicCrop in order to get rid of the darkened corners, then used DBE with tolerance 2 and samples of 100-200 and image now looks much better. |
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| Use an image editing program, mask the rosette and use a curve to reduce the blue channel. PI is good but it isn’t the best tool for everything. |
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Try increasing the Tolerance (in model parameters 1) to at least 2 in DBE. I noticed it works more aggressively. Also make sure to put enough Samples all around the nebulosity. Your suggestion worked! Thanks, Glenn |
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| @Glenn Silverman No problem. I had only 3-4 days of Pixinsight experience, and it was only by luck that I discovered the Tolerance thing (it helped to remove complex gradients on my images too). CS messierman3000 |
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@Glenn Silverman No problem. I works like a charm. Thanks for the tip. Glenn |
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Now, if I only knew how to reduce the number of stars. Glenn |
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| Starnet++. |
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Something is off in your setup; I had the same setup (2600mc, l-enhance, Redcat 51v2) and shot almost the same frame just last month; the dark band on the right side of the image shouldn't be there. Can you share your light/flat frames (dark/bias doesn't matter much with that camera)? I bet there is something off in your imaging train. Let's assume calibration frames are done right and your imaging train is all in good shape. What I would suggest is to use `dynamic background extraction` with about 60ish points making sure none falls over any star or nebulosity, and see the result. You can play with tolerance and see if that helps, but again, I found it more important to have all samples on the background, not stars. Here is the star reduction script I use, along with the youtube link https://www.amazon.ca/clouddrive/share/t37K5QLnJq5H7yU9fJq6gpmc8oe823hM0snoi9WUa4J https://www.youtube.com/watch?v=4rhvHEBmjcM |
