Paramount
20-11-2008, 11:33 AM
Hi all
I've almost recovered from my laryngitis and there was the promise of some clear weather last night so needs must as they say and I just had to get out and take some pictures. I decided to tackle IC 1848 as I hadn't tried this subject before, I was aiming for 2 hours per filter in 10 minute unguided subframes but as is usually the case with the British weather there was a couple of periods of cloud which wiped out 2 of the Ha and 1 of the OIII subframes. For the rest of this imaging run the seeing wasn't very good, I could just about make out Cassiopeia as the sky appeared a bit misty, this was confirmed by the noisy image and gradient on the image when processing which I think I have managed to get rid of the worst through processing (so please excuse the over processing). I colour combined the image as an LRGB combine using the Ha data as a luminance channel and then asigned SII=Red Ha=Green and OIII=Blue with a weighting of 3:1:2 for the respective RGB channels. Some people may say that this is wrong to use the Ha as a luminance channel when there is already Ha as a colour channel and this doesn't give a "scientifically" correct image, but I don't image for scientifically correct images I image for enjoyment and because I find the results pleasing. Anyway, that is enough of my ranting, I hope you like the image
Thanks for looking
Best wishes
Gordon
http://www.imagingtheheavens.co.uk/USERIMAGES/IC1848small.jpg
I've almost recovered from my laryngitis and there was the promise of some clear weather last night so needs must as they say and I just had to get out and take some pictures. I decided to tackle IC 1848 as I hadn't tried this subject before, I was aiming for 2 hours per filter in 10 minute unguided subframes but as is usually the case with the British weather there was a couple of periods of cloud which wiped out 2 of the Ha and 1 of the OIII subframes. For the rest of this imaging run the seeing wasn't very good, I could just about make out Cassiopeia as the sky appeared a bit misty, this was confirmed by the noisy image and gradient on the image when processing which I think I have managed to get rid of the worst through processing (so please excuse the over processing). I colour combined the image as an LRGB combine using the Ha data as a luminance channel and then asigned SII=Red Ha=Green and OIII=Blue with a weighting of 3:1:2 for the respective RGB channels. Some people may say that this is wrong to use the Ha as a luminance channel when there is already Ha as a colour channel and this doesn't give a "scientifically" correct image, but I don't image for scientifically correct images I image for enjoyment and because I find the results pleasing. Anyway, that is enough of my ranting, I hope you like the image
Thanks for looking
Best wishes
Gordon
http://www.imagingtheheavens.co.uk/USERIMAGES/IC1848small.jpg