Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: JohnP on Oct 17, 2008, 14:56:56

Title: Elephant - RGB
Post by: JohnP on Oct 17, 2008, 14:56:56
I'm giving up on this now - tried about a zillion reprocesses of the RGB I got for my Elephant Trunk Neb image down at Les Granges.. this is about the best but I'm still not happy. I think I probably didn't get enough colour data to go with the Ha data that I got... :-( I've also put Ha data underneath...

Anyway, here it is....

Cheers,  John.

(http://gallery.orpington-astronomy.org.uk/albums/userpics/10007/elephant-rgb.jpg)

(http://gallery.orpington-astronomy.org.uk/albums/userpics/10007/elephant.jpg)


Title: Re: Elephant - RGB
Post by: Mike on Oct 17, 2008, 15:05:30
Looks good to me. Lots of detail along that thin section of the 'trunk' and good focus. Nice image.
Title: Re: Elephant - RGB
Post by: Mac on Oct 17, 2008, 20:44:47
Nice detail.

Just out of interest, how are you adding the Luminance data?
Are you converting the Image to a LAB, and then adding the Luminance layer, and converting back to RGB?
Or do you do it a completly different way?
Title: Re: Elephant - RGB
Post by: Rocket Pooch on Oct 18, 2008, 14:46:04
looks good to me...
Title: Re: Elephant - RGB
Post by: JohnP on Oct 18, 2008, 15:02:40
Cheers everyone - I may try saturating it a little more - The hardest thing was trying to keep the 'horrendous' blue halo's at bay....

Mac - I use a couple of methods for adding the L as follows:

1. Process the L & RGB separately & then convert the L (or Ha) to RGB mode & then paste the colour image on top as a new layer then change the blend mode from Normal to 'colour'... or

2. Process the RGB image & then copy & Paste the L layer on top & change the blend mode from Normal to 'Luminance'.. (this is what Chris does)

HTH,  Cheers,  John
Title: Re: Elephant - RGB
Post by: RobertM on Oct 18, 2008, 16:13:07
John, I've just posted my Halo removal method in the Technical area.  It's not a perfect solution in all cases and is a bit tedious but if it helps then all well and good.

Cheers