who wants to stretch an image!?

[Rustang]

So I'm struggling with longer  (2min) sub images as they more "washed out" than normal even with a decent LP filter. The final stacked image is very difficult to get any contrast between the sky and the faint objects/nebulousity I'm trying to capture. If i could somehow send my DDS stacked image to someone, would someone take a few minutes to see what they can get out of it for my learning purposes? if yes then whats the best way to get you the DSS image?

[happy-kat]

What does the light histogram look like on one of your light frames?

Drop box.

[Rustang]

17 minutes ago, happy-kat said:

What does the light histogram look like on one of your light frames?

Drop box.

All in the middle, very similar to a flat frame's histogram!. This is a 2min sub with LP filter in a Bortel 6 environment. The way I normally get rid of gradients seems to upset things aswell.

 

[ollypenrice]

Put the file in Dropbox and then paste a link on here so folks can download.

Olly

[Rustang]

15 minutes ago, ollypenrice said:

Put the file in Dropbox and then paste a link on here so folks can download.

Olly

Just waiting for it to upload, its a big file!

[ollypenrice]

1 minute ago, Rustang said:

Just waiting for it to upload, its a big file!

I bet it's bigger still from where I live!  Rural French internet...

lly

[Rustang]

Hopefully this will work as Ive never done this before! Go find my horse! ?

 

https://www.dropbox.com/s/i3gvr8azqgva9nb/HorseyNewStack.TIF?dl=0 

[knobby]

OK, I'm naff at this stuff but had a quick go, no time to deal with gradients but quick curves several small goes and rgb levels several times, resized for forum and saved as png

 

[Rustang]

3 hours ago, knobby said:

OK, I'm naff at this stuff but had a quick go, no time to deal with gradients but quick curves several small goes and rgb levels several times, resized for forum and saved as png

 

Thats about where i got but its the gradient that's killing it and my normal process to get rid of it that i got online from the Astro back yard guy isant cutting it! Thanks for having a go. 

[knobby]

This works for me 'sometimes'

http://www.flemingastrophotography.com/gradients.html

[geordie85]

Here's what i could could do with your data. I had to crop certain sections out due to a weird ring round the outside.

Stretched with curves and levels. removed as much of the gradient as i could via Gradient Xterminator and AstroFlat Pro. Noise reduction was done with google's nik collection Dfine 2.

[Rustang]

2 hours ago, geordie85 said:

Here's what i could could do with your data. I had to crop certain sections out due to a weird ring round the outside.

Stretched with curves and levels. removed as much of the gradient as i could via Gradient Xterminator and AstroFlat Pro. Noise reduction was done with google's nik collection Dfine 2.

Nice, good to know there's away but much to improve. Thanks for having a go. 

[geordie85]

8 minutes ago, Rustang said:

Nice, good to know there's away but much to improve. Thanks for having a go. 

Did you use any calibration frames? 

[Rustang]

1 hour ago, geordie85 said:

Did you use any calibration frames? 

Yes, just flat's and bias, 20 of each I think. Anything you can say for improvement I will welcome it. 

[geordie85]

4 minutes ago, Rustang said:

Yes, just flat's and bias, 20 of each I think. Anything you can say for improvement I will welcome it. 

I'd revisit the flats. I suspect that's where the weird ring is coming from. 

And as always, more data will only help the final image. 

[Rustang]

6 hours ago, geordie85 said:

I'd revisit the flats. I suspect that's where the weird ring is coming from. 

And as always, more data will only help the final image. 

Ok, I will take a look at re doing some flats, thanks for the advice mate. 

[geordie85]

No worries. I hope you get them sorted