Siril 1.0.3 new features

[markse68]

Just watched this nice tutorial on new features in Siril- a new background extraction tool and General Hyperbolic Transform stretching and look forward to playing with them

https://youtu.be/ugpiLAwiGAg

Mark

[AstroMuni]

Gave it a try using one of my images of M13. On the left is using asinh, histogram stretch and on the right is using GHT. Certainly makes a big difference without blowing out core or star bloat.

[ONIKKINEN]

The price to performance ratio of Siril just keeps on getting better.

Looks like there is some learning to do with the new stretching tool. I couldn't make perfect sense of it in a few minutes at least.

[markse68]

12 hours ago, AstroMuni said:

Gave it a try using one of my images of M13. On the left is using asinh, histogram stretch and on the right is using GHT. Certainly makes a big difference without blowing out core or star bloat.

That worked great Astromuni- you managed to stretch much more detail out whilst improving the star colours! I too was playing with my M13 data last night with the new tools as it happens, but struggled a bit- need to play some more. What are the details for your M13? (scope, camera, exposures, bortle etc) How did you choose the symmetry point- middle of the histogram spike?

On a tangent, looking at Globulars it’s easy to just dismiss them as “they all look the same” “just a mass of pretty coloured stars” but they are a real challenge to image well I think. In M13 there’s a star of interest- Barnard 29-M13. It’s believed to be at the end of its life and could be about to form a planetary nebula.

http://www.messier.seds.org/more/m013_b29.html

I believe it’s the particularly bright blue star i marked up in your image here. Find the distinctive triple orange stars, move across to the other side to the paw print stars then follow the outer 2 toe print stars to the bright blue star- I think that’s Barnard 29- M13 (correct me if I’m wrong)

Mark

PS your image is flipped compared to mine- didn’t you do photometric cali? Mine gets flipped when i do

Edited July 2, 2022 by markse68

[AstroMuni]

On 02/07/2022 at 09:53, markse68 said:

PS your image is flipped compared to mine- didn’t you do photometric cali? Mine gets flipped when i do

Siril complained that it couldnt do photometric calibration on mine, perhaps due to the small FOV.

On 02/07/2022 at 09:53, markse68 said:

What are the details for your M13? (scope, camera, exposures, bortle etc) How did you choose the symmetry point- middle of the histogram spike?

Astromaster 130 on HEQ5 Pro, ASI224MC, 30s x 60 subs. Bortle 6.

I didnt muck about with the symmetry point, just left it at default.

Something new to learn about Barnard-29. I wasnt aware of this  🙂

Edited July 4, 2022 by AstroMuni