Really struggling with this

[Earl]

Could anyone have a look to see whats going on here I just get a blue mess

Cheers

Wrong file oops

[Komet]

109mb?

[shaunster]

Its meant to be M31 yes? I downloaded the first file is it the right image?

[Earl]

yes m31 but not that one, im just uploading the right one.

the 109mb one was from my Dslr last month

[Earl]

This one sorry

Autosave016.tif

[shaunster]

Was this taken with a OSC CCD under bad light pollution?

Ive attached a version that removed the blue using pixinsight background neutralisation but you also have some colour gradients in there as well.

Edit: Just re attached the image after using some SCNR in pixinsight to remove the green tinge to the galaxy

[Earl]

The Full moon I think was the LP issues, I could not get pix insight to remove the blue it just got worse... humm

Sorry yes OSC

[shaunster]

Once the blue and green was removed the gradient is just what you would expect under a full moon and the detail looks quite good considering its unprocessed really. Im sure on a moonless night with more subs you will have a much easier time processing this!

BTW in pixinsight to remove the blue I used background neutralization tool. Go process -> colour calibration -> background neutralization and have a play, you have to remove the blue before you do any other processing, so just use the screen transfer function to see what your working with.

[Earl]

Im going to see if i can get to the same point you have.

[shaunster]

Here you go, this explains it if your having trouble http://www.harrysastroshed.com/pixuser/bn.html

Its a powerful tool once you get used to it.

[Earl]

I have just noticed one very bad sub so im going to do a restack

[Earl]

I have been able to match that now, but cant get DBE to deal with the gradient.

[malc-c]

Tweaking the curves in PS got it a bit darker, although it some how the forum seems to of changed it's colour balance

[Earl]

The Automatic background extractor has done quiet a good good, ill see what DBE now does

[Earl]

OOO ok getting somewhere now

[harry page]

Hi

DBE will clean it up a lot ( up tollerance to 2 ) and use scnr to remove the last of the green

Harry

[Earl]

Cheers Harry I have been able to get it very close to that now, I was a little worried about the number of Red Stars or are these hot pixels?

[shaunster]

Sorry I deleted the large image but tiny red dots you mean? then yes they are hot pixels and darks will sort that out.

Glad your sorted, looks a good start to an image considering a full moon was out..

[Earl]

Im not sure if to scrap these subs and just get another set, are they worth keeping?

[harry page]

Hi

I presume you mean the red star halos , this might be CA from your scope ( usually blue though ) this can be made worse with the focus not being perfect;)

Does your camera have a infared filter to cut down on star bloat ?

Regards Harry

[Earl]

afaik my CCD does have an IR filter built in, although i have not been able to confirm that on any spec sheet.

[ollypenrice]

I never shoot anything but Ha if there is any moonlight whatever, including any peeping over the horizon. I'd start again, personally, though it might be possible to use what you have in greyscale to boost to the Lightness layer of a later image. (Just go into LAB colour mode, split channels, and see if layering on the greyscale does anything for the lightness image noise-wise.)

Olly

[Earl]

Im going for a fresh session Olly the gradient does go, but it does not make life any easier.

[Coco]

I've all but given up shooting OSC on Moonlit skies... I'm on the Market for a Ha filter..