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I haven't found much benefit in synthetic luminance from RGB filtered images.
I think its better to simply take more luminance.
I usually bin my RGB so it also tends to be lower resolution.
Also colour is often taken when the object has moved away from the zenith as you concentrate on getting the sharpest luminance images first unless you do luminance on one or several nights and colour on another.
There's no substitute for high QE cameras, fast optics with large aperture and good seeing with dark skies plus good tracking.
That technique was developed at a time when the typical CCD had 50% QE or less and optics tended to be slow. Its a bandaid solution.
The best images have the best basics in them that were done very well not processing trickery which always shows through like cosmetic surgery always seems to.
Greg.
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