4 replies to this topic

[Ballyhoo]

I think I should be able to get more detail and dark nebula in my image after 5 hours of integration. Or have I come close to maxing out my proc?

 

I know it might be asking a lot for others to give it a try but here is the link to the LRGB masters:

 

https://1drv.ms/u/s!...KAIqrQ?e=davktf

 

Here is the AB version:

 

https://www.astrobin...oxhph3/?nc=user

 

 

[Rasfahan]

I don‘t know your sky brightness, but I think that is about the extent I would expect to see after 5h at a bit below f/5. with an 80mm lens if you are not in a really dark spot. The darker parts of the nebula start to get noisy, so I think this is, basically, what gets above the noise. You can try some noise reduction for a more aggressive stretch, but I think this will not improve the image. You can try some masked local histogram equalisation, but I think that will only get you some added sharpness for the brighter parts, not more dark nebula.

 

I will try myself later on your data, though.

[Rasfahan]

 

So, there is a lot more nebula detail there, I was mistaken. I just did LRGB-combination, Photometric Color Calibration, HDRMultiscaleTransform (5 layers) and ArcSinHStretch, and a bit of a sinusoidal curve to L. It took me only a few minutes. Unfortunatly the core is blown out and the stars are blown out in red - you should try a bit shorter subs. This image is very much reduced, but it still looks good at full scale, no excessive noise in the shadows. I have not tried to fix the stars, probably works with a blurred star mask and Morphological Selection on the R image only. I cannot do Photoshop, only Pixinsight.

Edited by Rasfahan, 22 January 2021 - 02:13 PM.

[Ballyhoo]

wow, I have still quite a bit more proc to learn. Also I have been imaging at 180 seconds in bortle 4.5.  So, I suppose I will draw it back to 2 min. 

[Rasfahan]

This was a real quick processing, there is a lot more data there. The quintessence was to use HDRMultiscaleTransform and ArcSinhStretch, those tools are very useful for bright, colourful targets with dim nebulosity.