I've been working on an image that I have 3 hours for each red, green, and blue channel along with 10 hours of luminance data. While this makes a decent LRGB image it leaves the faint nebula really faint.
Did you try adding synthetic luminance from the RGB data into the real luminance? That might give the lum a bit of a boost.
I do have 4 hours of Ha daat that might help bring out the most Hydrogen nebula but not really sure how to use it along with the luminance. Should it be combine to the RGB image or the luminance. If so what is the best way to combine them. The RGB, luminance, and Ha images are all properly registered. I combined the RGB and Ha using the NBRGB Combination script but this gives a resulting image less the luminance. Suggestions welcomed.
I'm not a big fan of the NBRGB or similar scripts. They seem to work for some folks but I've never been happy with the results
If there's lots of detail in the Ha that is missing from the lum then I will usually blend them while linear (ImageIntegration for a noise-weighted blend or just a simple PixelMath proportional blend after a LinearFit.) Sometimes I'll blend Ha into the R as well, especially if the lum blend is giving washed out pinks.
Another option that works well with some data sets is to build a red or magenta (RGB) image from the Ha and then blend that with the RGB or LRGB image.
And finally, sometimes I'll use the Ha as a mask on the LRGB image and use CurvesTransformation to play with some of the curves, e.g. R, a* and L. This can work well for tasks like enhancing small Ha regions in galaxies.
Hope that's given you some ideas...
Cheers,
Rick.
