Stacking for Linux

[alacant]

If you're used to DSS, we hope this will come as a nice surprise. A very simple getting started stack with Siril under Ubuntu; in English. No explanations, no theory. Just hands on what to do.

Do feedback if you have a go:) Yes, there's a windows verion too. Download for all versions.

Cheers and clear skies.

 

[Atreta]

Thank you,  this will be useful for me. I'll post when i test it. 

[Atreta]

I had a go yesterday,  it's an interesting program, worth using in linux.  Besides it has some post process tools too.

The stacking of 75 frames took almost two hours(119 minutes) on my notebook. 

Maybe it's just an impression but i think the stack got more detail and color than with dss, but to me dss is far easier to use and faster. 

Thanks again for sharing, i didn't know of this program. 

[alacant]

7 hours ago, Atreta said:

stacking of 75 frames took almost two hours

Really? Oh dear. Even on an old Acer, 25 frames just took me under three minutes. That's with fits files. Are you using one of the fancy normalisations perhaps?

[Atreta]

I don't remember if i chose sigma clipping or median sigma clipping, it was one of the two and no normalization. Maybe it's the version I'm using, it wasn't the latest, I'll update it and run again. 

The notebook is an I5 7300hq with 8gb ram. 

Edit: I noticed one other thing, the cpu usage was super low, it didn't even make the fans spin like it does when there is high cpu usage.  

[Atreta]

Good news, i updated to the latest version and ran the same stacking and it took now about 4 minutes to finish. 

 

[alacant]

57 minutes ago, Atreta said:

i updated to the latest version

Good news. Here are my timings for 51 frames:

Pre-Processing and registration around 2 min

REGISTRATION

08:31:35: Sequence processing succeeded.
08:31:35: Execution time: 6 min 02 s.
08:31:35: Registration finished.
08:31:35: 51 images processed.
08:31:35: Total: 0 failed, 51 registered.
08:31:38: Reading FITS: file r_pp_Light_041.fits, 3 layer(s), 5184x3456 pixels
08:31:38: Sequence loaded: r_pp_Light_ (1->51)
08:31:38: Closing sequence pp_Light_

STACKING

08:34:40: Using 1429 MB memory maximum for stacking
08:34:40: Stacking: processing...
08:34:40: Stacking all images in the sequence (51)
08:34:41: We have 15 parallel blocks of size 691 (+1) for stacking.
08:34:41: Starting stacking...
08:39:59: Pixel rejection in channel #0: 0.000% - 0.572%
08:39:59: Pixel rejection in channel #1: 0.000% - 0.741%
08:39:59: Pixel rejection in channel #2: 0.000% - 0.762%
08:40:00: Integration of 51 images:
08:40:00: Pixel combination ......... average
08:40:00: Normalization ............. none
08:40:00: Pixel rejection ........... sigma clipping
08:40:00: Rejection parameters ...... low=4.000 high=3.000
08:40:00: Saving FITS: file r_pp_Light_stacked.fits, 3 layer(s), 5184x3456 pixels
08:40:01: Background noise value (channel: #0): 6.386 (9.745e-05)
08:40:01: Background noise value (channel: #1): 5.831 (8.897e-05)
08:40:01: Background noise value (channel: #2): 4.729 (7.216e-05)
08:40:02: Execution time: 5 min 22 s.

With DSS you'd already be on your third coffee!

Cheers and clear skies.

[lock042]

Hello.

I really think you should normalize your images during stacking. If not, you will stack images that are not consistent and sigma clipping will give bad results.