A Fiery bubble
Posted 16 September 2013 - 09:41 PM
Small with specs:
Fit to Screen:
Posted 17 September 2013 - 10:41 PM
Posted 18 September 2013 - 11:35 AM
Very nice image. I'm interested in the processing details.
QSI683/RC10 at F5.4
16 x 1200 HA
20 x 1200 OIII
Red = HA 100%
Green = HA 10%; OIII 90%
Blue = OIII 100%
Used Clipping Masks to blend color channels. The combined green channel ended up with a much more "left shifted" pedestal than the red and blue, and when I pulled the Red and blue channels to the left at the end to match, the overall image went a bit from the intended deeper red to the more fiery red/orange. I liked it, so I left it.
Posted 18 September 2013 - 05:13 PM
Posted 18 September 2013 - 09:40 PM
I was surprised at how much your bicolor image matched the color of the tri-filter natural-color narrowband image of the Bubble that I posted the same day. I think they match because the SII in this object pretty much follows the distribution of the Ha. So when you blended Ha into your green channel you highlighted the same "fiery regions" as the SII did in my version. Very interesting.
Thanks Mike & Keith.
Keith - Maybe also since I actually tried to balance the channels on the histogram, and the fact that the HA is so strong, the colors want to end up around where yours are. Yours has a more balanced look to it, plus the stars are pretty much correct. Here is (calibrated via bf-astro eXcalibrator) an unprocessed crop of RGB from CCDstack that I was planning to put in (got lazy and didn't) to enhance the stars. Yours stars match up pretty close. Pretty cool since it is all narrow band.
Posted 18 September 2013 - 10:20 PM
Here is (calibrated via bf-astro eXcalibrator) an unprocessed crop of RGB from CCDstack that I was planning to put in (got lazy and didn't) to enhance the stars. Yours stars match up pretty close. Pretty cool since it is all narrow band.
Yes, that is something I discovered when I started blending the yellow back into the natural-color narrowband palette - it seemed to add a more natural balance to the star color. Your RGB image confirms that impression - although I can't say I really understand why. Thanks for posting that John.