Quote:
Originally Posted by glend
Darn it, Lee you beat me to it. Looks wonderful. I've only shot the Ha and Sii so far but need more, much more. There is never enough signal.
Please share your processing techniques?
|
hah, sorry Glen. Sounds like you'll be gathering much more data than I bothered with anyway, so I may have beat you to the punch, but you should get some cleaner data :-)
All processing was done in PI.
Pre-processing:
* Weight images according to FWHM (smaller number = more weight) and eccentricity (again, smaller = more weight)
* Calibrate using bias only
* Register all images against the best sub (an OIII with a FWHM of ~1.4")
* Integrate Ha, OIII and SII separately, using one of the Sigma clipping algorithms
Luminance:
* Create luminance from H/O/S using PixelMath h*0.4+o*0.4+s*0.2
* Create range mask to protect big blown out stars
* Deconvolute the crap out of it, with the range mask applied, using ~100 iterations
* Stretch using multiple iterations of Curves & Histogram Transformation
* Apply mild dark structure enhance
* Apply mild local histogram equalization (radius 64)
Colour:
* Linear fit O and S using H as a reference
* Use LRGB Combation to combine R = O, G = H, S = B
* Use curves on different colour channels to better balance the colours visually speaking
* Stretch using masked stretch (all default options)
* Create a star mask
* Using star mask run a couple of iterations of SCNR over the stars to neutralise the purplish stars
Combine lum and colour using LRGB Combination, dropping the saturation slider to increase saturation.
I think that pretty much sums it up. Sounds like a lot now after I type it out, but there's really not much to that.
Quote:
Originally Posted by Slawomir
The image looks very nice Lee.
I agree, Carina nebula is such a wonderful and dynamic dso, and in spite of her brightness composing beautiful image of the Carina nebula certainly takes some dedication and skills.
Looking forward to further revisions  |
Thanks Suavi! Since posting this I've uploaded another version to Astrobin, and I think I'm fairly happy with that one, so I might just let it sit for a while.