[test image] - Horsehead Nebula

[AstroGS]

Continuing my tests of the rig at @PixelSkiesAstro, here is a quick iteration of the Hosehead Nebula.

It is not the first time that I am imaging this target but, it is definitely the first time that I can see this level of detail. I am sharing the final (quick processed image) + the starless one, which I feel is breathtaking. I am missing more Ha from the image but, it is still nice.

Ha: 13 x 300sec

SII: 9 x 300sec

OIII: 17 x 300sec

+ calibration frames: flats, darks and bias

RedCat61 on a ZWO AM5

2600MM with Antlia filters

Integrated and processed with PI + XT suite + Foraxx + GraXpert. I did not try to darken the background as, I wanted to showcase the beauty of the dust. If you can advice on how to reduce the brightness while maintaining the dust detail, I’m very interested to know how 😀

Edited February 3 by AstroGS

[AstroGS]

One more - played with the curves and darken the background, although I said I wouldn't.

Edited February 3 by AstroGS

[ollypenrice]

The sweet spot lies between your two renditions. Learning to manage the stretch is really the essence of post processing. Work only in small iterations...

Olly

[AstroGS]

28 minutes ago, ollypenrice said:

The sweet spot lies between your two renditions. Learning to manage the stretch is really the essence of post processing. Work only in small iterations...

Olly

So, one area to improve is the stretch and that way I can control better contrast and the background?

 

[ollypenrice]

31 minutes ago, AstroGS said:

So, one area to improve is the stretch and that way I can control better contrast and the background?

 

Yes, the stretch is everything.

There are various ways of controlling it. Some astro processing packages have an assortment of ready made stretches which offer educated guesses as to what might work with your data. Try them by all means but the craftsman's tool, in my view, is Curves.

It's too big an area for a quick explanation here, I'm afraid, but tutorials by Adam Block, Warren Keller or Robert Gendler won't disappoint. If ever you hear a U-tuber say, 'I just play with the sliders till I like what I see,' turn him off and don't go back. There are millions of subscriber-hungry beginners thrashing about in the dark with not a clue as to what they are doing.

Olly

[CCD Imager]

14 hours ago, ollypenrice said:

Yes, the stretch is everything.

There are various ways of controlling it. Some astro processing packages have an assortment of ready made stretches which offer educated guesses as to what might work with your data. Try them by all means but the craftsman's tool, in my view, is Curves.

It's too big an area for a quick explanation here, I'm afraid, but tutorials by Adam Block, Warren Keller or Robert Gendler won't disappoint. If ever you hear a U-tuber say, 'I just play with the sliders till I like what I see,' turn him off and don't go back. There are millions of subscriber-hungry beginners thrashing about in the dark with not a clue as to what they are doing.

Olly

I think PIxinsight's GHS goes a long way to help folk with stretching, but I agree curves misuse is probably the most typical pitfall in processing

Adrian

Edited February 4 by CCD Imager

[AstroGS]

 A new version - now that I found about stretching, I am playing around with almost all my images and trying to see if I can get more detail out of them.

Used for the first time also PI's new Gradient Correction module.

Thoughts?

 

[AstroGS]

I am still playing around with the data and how to improve my stretching techniques. Taking under consideration that the OIII filter had the issues I was facing at that stage (it was almost unusable) and using the Statistical Stretch + iHDR script, I re-processed the same data and came up with this (cropped)version of the Horsehead nebula.

 

[TiffsAndAstro]

On 03/02/2024 at 17:44, AstroGS said:

One more - played with the curves and darken the background, although I said I wouldn't.

This looks great. A minor, minor criticism is that in my mind, it should be red in colour but that's probably convention rather than anything else.

Some amazing detail here, I can't wait for it to be visible for me and my improved gear

[TiffsAndAstro]

6 minutes ago, AstroGS said:

I am still playing around with the data and how to improve my stretching techniques. Taking under consideration that the OIII filter had the issues I was facing at that stage (it was almost unusable) and using the Statistical Stretch + iHDR script, I re-processed the same data and came up with this (cropped)version of the Horsehead nebula.

 

Wow. I loved the earlier versions, but this is better again.

[Vroobel]

I like the 3D structures and details. 🙂

I also look at the Statistical Stretch and the iHDR scripts, but without examples it's hard to experiment with the numbers and sliders. Till now I base on the GHS, masks and Selective Colour Correction. 

 

Edited May 25 by Vroobel