PixInsight Forum (historical)

PixInsight => General => Topic started by: Batch on 2018 July 14 15:21:48

Title: Synthetic Lum or Filtered Lum
Post by: Batch on 2018 July 14 15:21:48

Over the past couple of years I have developed an interest in NB imaging and find that I now image most targets almost exclusively in NB (I may also add a small amount of RGB to correct the star colors). For processing purposes (and to allocate more acquisition time to NB) I have been creating a synthetic LUM using various combination of the NB Masters . This has proven pretty effective but I am wondering if I would get better results if I shot a series of LUM subs and if so how significant is the improvement?. So my question is should I take the time to image a separate LUM series and use it combined with the NB instead of using a synthetic LUM? Thanks

Batch

Title: Re: Synthetic Lum or Filtered Lum
Post by: RickS on 2018 July 14 16:37:51

Hi Batch,

I also combine the NB masters to produce synthetic lum.  I don't think "real" lum is going to match the NB colour very well.

Cheers,
Rick.

Title: Re: Synthetic Lum or Filtered Lum
Post by: pfile on 2018 July 14 16:49:22

are you in a high LP area?

i think one problem with the idea of using a real L image is that the bandwidth of the L image is enormous compared to the NB image. so you're going to pick up stuff that has been filtered out of the NB images with the L and if you have any sort of LP going on the L is really going to contain a bunch of extraneous light, for which you have no color info in the NB channels used to make the RGB...

rob