Unbinned LRGB

[bhwolf]

Hi all,

I've had good results with RGB unbinned creating a synthetic lum.  But, since I had some time over a few nights, I decided I'd try L unbinned and RGB binned 2x2 of M101 just to see how I liked to results.

Night 1 was all L, night 2 was RGB (short nights!). For whatever reason all RGB ended up unbinned (1x1) so I'm debating a workflow for processing. This was a short focal length (530mm @ 2.1"/pix) so perhaps unbinned on the RGB was a nice accident as some have suggested that binning @ short FL doesn't yield much benefit.

I've got this thread bookmarked as it has a number of great considerations in it:
http://pixinsight.com/forum/index.php?topic=1636.0

Any suggestions on a strategy?  Generate a synth lum from RGB and disregard the lum?  Create a master Lum of both the lum + synth lum, then combine RGB? 

Thanks much!

[Dimitris Platis]

Since both r unbinned u should definitely create a synth Lum (L+RGB) and then combine RGB.....why disregard Lum?

[bhwolf]

Thanks!  My only reason for disregarding L would be potential reduction in chrominance, though I'm just making guesses.

I'm going to try this a number of ways to see and just tinker a bit with PI, but would the new synth lum be a combination of the actual lum plus the RGB synthetic lum?  (That's what I was thinking to try...)

[Dimitris Platis]

Well....addition of RGB in the Lum channel shouldnt cause a huge imbalance between Lum and chrominance...thats for sure. If u dont have it already addition of RGB in Lum wont tip the scale.
After all, u can add a bit of chrominance noise reduction....so u will need the added detail in the Lum channel