HELP! Siril background extraction is making the image worse!

[cursive yacht]

Idk how to fix this, please help!

[visual wren]

that sounds about right, sirils background extraction isn't very good. I'd recommend trying graxpert, it's served me very well

should be able to get rid of almost all gradients in the image

[cursive yacht]

Can you only get it with Pixinsight?

[visual wren]

no, it's a free standalone app

[cursive yacht]

Really! Ill check it out! Thank you!

[visual wren]

np! hope it helps!

[north obsidian]

Did you tick the dither option?

[cursive yacht]

I did it with dither and without

[north obsidian]

Sometimes the autostretch will look worse than it actually is, try to stretch it even if it doesn't look great in the preview

[cursive yacht]

I did, looks pretty horrific

[north obsidian]

Then that's not the case lol

Yeah try graxpert and see how it goes

[cursive yacht]

uhhhh

[visual wren]

oh if you click calculate background that should remove the gradients

[cursive yacht]

this was it before I hit calculate background

[visual wren]

oh that reminds me, graxpert also has an ai mode for gradient removal and denoising, it typically does a really good job

[cursive yacht]

Ok I'll try that

[glass arrow]

just use the ai one

[visual wren]

and if you need any help with it, deep space astro has this really useful walkthrough: https://www.youtube.com/watch?v=EQN4tvsVTgI&t=1s

[glass arrow]

that manual one is identical to sirils

[cursive yacht]

this pic does not like background extraction

[glass arrow]

that was with the ai one?

[cursive yacht]

Yeah

[glass arrow]

you might be cooked

[cursive yacht]

😭😭

Link to the file if anybody wants to try

https://drive.google.com/file/d/1u8IB1N8ld_6EZbgfSp9wiL_rnDoLe8hD/view?usp=sharing

[visual wren]

i had to crop it pretty heavily so framing is weird now, but here's what i could fix https://drive.google.com/file/d/1bvT0zEh7WS-oyaWXG9AJypIfA8vPzM4D/view?usp=sharing

it's a little better, but still has some weird gradient

[orchid wasp]

I don't know if it will work
But try setting smoothing to 0 with the ai for a test@cursive yacht

[timber osprey]

@cursive yacht Are you placing the samples correctly? I’ve had the best experience with Siril background extraction compared to graxpert

[stoic plume]

GraXpert is quite bad from my experience. Manual background extraction is much easier. The gradient here looks very complex. Artificial flats with photoshop or MSGR is best here.

[dusky heart]

That's pretty funny to read. RBF interpolation (the default one) in Background Extraction tool in Siril was written by the Gaxpert dev, it uses the same algorithm

Something went horribly wrong with this data. You have overcorrecting flat's I'm pretty sure, there's a VERY strong gradient on the top (so strong in fact, that DBE refuses to correct it) and there's a lot of banding.

What's your cam and bortle? How did you take flats and how long were they? Which calibration frames did you use? Do individual subs also display this gradient?

You have decent signal, there's even some IFN visible. The data can be saved I think but we need more details to help

[north obsidian]

Good point on the flats, how does a single flat look and did you try to stack without them?

[cursive yacht]

I took it with a Televue np101 on loan, Sony a6400, and bortle 5-6