@Boyan Kassabov kindly provided me with his super luminance data of The Ghosts Nebula - my favorite night sky object. His data is quite good - has very low noise and lots of details. However I image at lower resolution per pixel than him so I used one of my frames as reference one.
In short here is how I processed the image:
- aligned the luminance with my stack;
- extracted the luminance from my stack as well;
- combined the two luminance files through Gradient Merge Mosaic in PI - used the average option. I think my data very slightly improved the already very good quality of Boyan's luminance;
- then cropped the image to the luminance of Boyan;
- processed the color image and the luminance separately;
- after the histogram stretch I added the luminance to the color image;
- then made final processing - one with full stars and one with reduced stars;
I really love the result.
The total integration of data is 64 hours as follows:
-/ My data:
Imaged with my ZWO Asi 533 in Y2020 - a total of 10 hours and with my ZWO Asi 2600 in Y2021 - a total of 24 hours.
-/ Boyan's data:
R 36 x 180 s 1.8 hrs
G 39*180 s 1.95 hrs
B 40 x 180 s 2 hrs
L 292 x 300 s 24.3 hrs
Everything with QHY 22 camera cooled at -20 C in 7 nights between august and october 2019
Clear skies!
Ivan
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