Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Fay on Oct 06, 2008, 19:52:41

Title: M33 Les Granges RGB
Post by: Fay on Oct 06, 2008, 19:52:41

M33 16x300secs Atik 314L, WO ZS66, Ha, no darks or flats.

I have worked for hours trying to get this processing correct. Every time I did it, it was too blue. I have read & concentrated on advice from Olly in France & this is the best I could come up with before going insane.



(http://farm3.static.flickr.com/2135/2918760223_c8ab4f17c5_o.jpg)
Title: Re: M33 Les Granges RGB
Post by: MarkS on Oct 06, 2008, 20:03:01

Fay,

Another excellent image with great detail.  My suspicion (and I've never tried) is that this one is more difficult to process than the Andromeda Galaxy.  You've done a good job there but the background might be a tad noisy.

Very nice.

Mark

Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 06, 2008, 20:11:59
Yes, I could have overdone it.
Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 06, 2008, 20:17:54

This is the luminance of M33

(http://farm4.static.flickr.com/3149/2918834793_251eb1c858_o.jpg)
Title: Re: M33 Les Granges RGB
Post by: Mac on Oct 06, 2008, 20:22:54
again fantastic image.

I bet you are plaesed as punch.
Title: Re: M33 Les Granges RGB
Post by: RobertM on Oct 06, 2008, 20:28:59
Luminance looks really good and I'd agree the image may be too blue (actually it looks like green).  I think it's easy to over cook this one as the whole galaxy is surrounded by an exceptionally faint halo which is very difficult to process, you've done a very good job though.

Title: Re: M33 Les Granges RGB
Post by: Daniel on Oct 06, 2008, 21:41:17
Really lovely, fantastic contrast while still keeping the whispyness, and some great detail on NGC 604. Maybe the core is a little more blown out than needs be, but that could be processed out easily, what you could do is process 2 seperate images, one aggressively to bring out the faint detail and one less aggressively for the more dense detail in the core, then use a layer mask to blend the two together.

By the way, Robert, i know what you mean by that halo, Im currently processing it in the data I got last night and it's really hard to stop it looking fuzzy like some noisy light polution instead
Title: Re: M33 Les Granges RGB
Post by: RobertM on Oct 06, 2008, 22:14:45
I'm processing M33 too, just a bit reticent about publishing it after all this lot!
Title: Re: M33 Les Granges RGB
Post by: Daniel on Oct 06, 2008, 22:30:40
I know what you mean, despite having 4 times as much exposure time as Fay's, my one can't compare.
Title: Re: M33 Les Granges RGB
Post by: Carole on Oct 06, 2008, 22:41:39
Looks fabulous to me Fay.  If I've understood correctly, with no darks there is amazingly little noise especially away from the nebula.

Carole
Title: Re: M33 Les Granges RGB
Post by: Jim on Oct 07, 2008, 07:04:10
Fay, that's really lovely. One for the calender I think.
Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 07, 2008, 08:23:19
Thanks for your comments. I will have another go at the RGB M33 as I think I can do better. I was pleased that I combined the frames ok & have remembered a lot of info that Olly, in France, gave me. There are a few bits I will have to clarify.

Chris & John are a lot better at processing than myself, as we have seen from Chris's images & will see from John's. It all takes so much time!!!!!!!!!!!!!!!!!!!!!!!!!! Good job we don't nornally take more than one image every 2 months!!!!!!!   
Title: Re: M33 Les Granges RGB
Post by: Mike on Oct 07, 2008, 09:17:44
Excellent image Fay. Well done.
Title: Re: M33 Les Granges RGB
Post by: Rocket Pooch on Oct 07, 2008, 13:33:33
Excellent one Fay just keep playing with the data you have it, so you could allways re-visit the processing at a later date.

This weekend I'll get the M33 I did process up on the forum including the whole luminance on the image.  I think considering the scope and camera you have your will be just as good as mine, but as you say its now a processing issue.

Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 10, 2008, 14:32:00

I think this is better, taken the brown away.


(http://farm4.static.flickr.com/3029/2929363734_88d4988c52_o.jpg)
Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 10, 2008, 14:50:10
It's getting on my wick,now. I have M33 in 4 different hues. I think I will stick to mono!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Title: Re: M33 Les Granges RGB
Post by: RobertM on Oct 10, 2008, 15:45:25
Don't give up Fay, that last one is very good and the stars look natural.  If you're frustrated then take a break and come back to it...
Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 10, 2008, 16:03:42
Robert, I need group therapy!! :cheesy:
Title: Re: M33 Les Granges RGB
Post by: MarkS on Oct 10, 2008, 16:16:34
Fay,

As Robert says, that last one looks really good.  The colours almost match my own M33 so it must be right :-)

Any tweaks you wish to make from now should be very minor ones.

Mark
Title: Re: M33 Les Granges RGB
Post by: Fay on Oct 10, 2008, 16:20:11
Thanks Mark, glad you said that. I was heading for blue!!!!!!!
Title: Re: M33 Les Granges RGB
Post by: Rocket Pooch on Oct 10, 2008, 17:45:22
fay whats up I got similar colours

(http://farm4.static.flickr.com/3252/2922908482_f7e6301188.jpg)
Title: Re: M33 Les Granges RGB
Post by: RobertM on Oct 10, 2008, 23:31:16
But Fay, you only had group therapy the other week  !