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Cygnus Loop, Steve Greaves
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Cygnus Loop

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Cygnus Loop, Steve Greaves
Powered byPixInsight

Cygnus Loop

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Description

I've been putting processing this image off for a while a I know it would take some time..

I didn't grab RGB stars,  and as a consequence of my 600 second image exposure time lots of small HOO stars show up, even with a light stretch, as bright points. I wanted to try RC-Astro's X suite and didn't know if the large number of 3 to 4 pixels super bright starts would cause an issue. So decided to drizzle integrated the mosaic. This improved the stars and  image resolution but created massive images files. ~1.8Gb per mosaic master ( w:19130px h:23417px) and after channel combination the HOO image was about 5Gb. I don't think this was sensible, but wanted to see how it would go, I expected my software to fail at some point. Well it took a lot of time, my PC is an 8 core ( 16 thread) AMD Linux box with 64GB DDR4 and  1TB NVME drive + 4Gb HDD, and it was sweating with  this work load. Pixinsight, however,  worked very well, I probably should have 128Gb for this size of work load. As mentioned I used RC-Astro's Xsuite and this also performed very well with the large image files. In the end I was pleased with my final image. It was too large for AstroBin, so I had to downsample and compress as using .jpeg ( 0.85). The result now shows some low level artefacts at high levels of magnification.

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Cygnus Loop, Steve Greaves