Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Fay on Oct 09, 2008, 11:44:10

Title: IC1805 Heart Nebula
Post by: Fay on Oct 09, 2008, 11:44:10

19x300secs Ha, 081008, Atil 3147L/ WO ZS66, 0.8 FR. Guided with K3CCD.
The colour is a bit green, but considering the conditions, I was quite pleased with it. 


(http://farm4.static.flickr.com/3001/2925896201_7d1033eea5_o.jpg)
Title: Re: IC1805 Heart Nebula
Post by: RobertM on Oct 09, 2008, 12:09:40
Lovely image Fay, you did well considering.  You're probably a bit shocked with this after those idyllic conditions last week !

You are right about the green - could do with a slightly better white balance.  Is this an HaRGB if so what were the RGB subs ?

Cheers Robert
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 09, 2008, 12:20:49
How do I change the white balance in Photoshop Robert? 

RGB subs were 5x300secs each colour   
Title: Re: IC1805 Heart Nebula
Post by: Daniel on Oct 09, 2008, 12:24:37
Ooooh, lovely, one of my fave's, although Im still to get the ideal framing for this one, only way I can is with the 80ED and a 0.63 focal reducer
Title: Re: IC1805 Heart Nebula
Post by: RobertM on Oct 09, 2008, 12:36:52
I've never done it in PS but it may be just a matter of adjusting each colour till it looks right.  In maxim you can either click on a star to choose that as the white point or adjust the % of each colour in the mix.

I will find out tonight as I have to do it myself !  If noone chips in before then I'll let you know.  btw have you checked that book I gave you on CD ?

Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 09, 2008, 12:38:45
Oh I will have a look at that.

I must get on with my chores now!!!!!!!!!!!!!!!!!!!!!!!!
Title: Re: IC1805 Heart Nebula
Post by: JohnP on Oct 09, 2008, 12:43:51
Fay - that's not too bad.. like Robert said a tad green... You could always try a remove halo's in astronomy tools. Also looks an 'itsy tichie bit' soft - probably down to seeing or did you do a blur of some kind to reduce noise. Probably just me being 'hyper' critical after the stunners you posted from last week.... :-)

Anyway - excellent & looks like you got your mount all up & running again after France...

Well done, John

Title: Re: IC1805 Heart Nebula
Post by: MarkS on Oct 09, 2008, 19:47:22

Fay,

It certainly is heart shaped.  It's sharper than I imagined given the terrible conditions last night.

Mark
Title: Re: IC1805 Heart Nebula
Post by: Rocket Pooch on Oct 09, 2008, 21:23:19
good one Fay when did you do that, was it when Jim drunk the whole bottle of whisky and half a bottle of wine?
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 08:28:14
No. I did it 2 nights ago
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 09:11:27
Chris,

how can I get the green out of the image?

Mike, why was Kielder not so good?
Title: Re: IC1805 Heart Nebula
Post by: RobertM on Oct 10, 2008, 10:25:29
Sorry Fay I didn't get the right results with my processing last night so I can't advise but you could try Rob Gendler's site.  His images always seem a bit overpowering but you might find some useful information.
Title: Re: IC1805 Heart Nebula
Post by: Mac on Oct 10, 2008, 11:48:18
Quotehow can I get the green out of the image?

Fay if you click on new adjustment layer and then click on the white eyedrop picker
Whichever colour you next pick will become white!
The same for the black and the grey.

So if you select your green/white stars, the colours will be adjusted so the stars will become white.

you might have to tweek the others a bit,

Its a quick way to remove colour casts.

(http://www.macrhon.co.uk/website/oasphotos/fay/fay1.gif)

(http://www.macrhon.co.uk/website/oasphotos/fay/fay2.gif)

(http://www.macrhon.co.uk/website/oasphotos/fay/fay3.gif)
Title: Re: IC1805 Heart Nebula
Post by: Tony G on Oct 10, 2008, 11:57:52
Lovely image Fay,

If this is an image you got from Chislehurst 2 nights ago, I can't wait to see your 'Les Granges' calendar.  :)

Tony G
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 11:59:22
Just had a go, Mac, & it did not work. It is the edges of the stars that have a green tinge, as has the whole image.

I have redone it about 5 times, until I am sick of looking at it. I may just use the mono image, although RGB gives a bit of depth.
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 12:00:41
Thanks Tony. Trouble is, I am getting more & more picky about the results, so am never really satisfied. Oh for the little webcam days!!!!!!!!!!!!!!
Title: Re: IC1805 Heart Nebula
Post by: Rocket Pooch on Oct 10, 2008, 14:30:50
fay you are mad, i personally do not want to go out at the moment because I still ave jet lag from holiday.
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 14:33:33
I know I am mad. I am thinking of going outside tonight!!!!! For something simple. Can't get used to all those flats & darks especially for RGB as well.
Title: Re: IC1805 Heart Nebula
Post by: JohnP on Oct 10, 2008, 15:42:08
QuoteOh for the little webcam days!!!!!!!!!!!!!!

Fay - I'll happilly give you my modified webcam if you want to give me your 314L

Sounds like a fair swop to me :-)
Title: Re: IC1805 Heart Nebula
Post by: Fay on Oct 10, 2008, 16:14:06
OK, at the moment I think mono is best

(http://farm4.static.flickr.com/3006/2929537840_cf96d23673_o.jpg)