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Blending HA data with Lum or Red channel.

starfield
in PixInsight
I'm trying to hunt down some options for blending in some HA data to complement some LRGB data I collected on M17 and M18.  I'm going to give the NBRGB script a try but was trying to see what other methods I could check out.   One thing I'd like to try is some using some Pixel Math expressions to blend in the HA into the Lum and possibly the red channel.   Not quite sure what this Pixel Math expression would look like?

Any advice?   I imagine there's got to be a lesson somewhere in either the Fundamentals or Horizon library that will get me headed in the right direction but I'm not quite sure where to look.  

Thanks.

--Steve

Comments

  • BlockHeadBlockHead
    Hi Steve,

    A couple of things....

    1. I show a method- one of many- in my Horizons NGC 6250 example: https://www.adamblockstudios.com/categories/ngc6250

    2. There are different ways of handling the blending of this kind of information. One way, as I did, is to use the Ha data as an enhancement for red information. In the case of M17, for example, the red you capture in broadband is very similar to the results you get with the Ha filter since these are pretty much red objects. 

    3. With regards to #2, what is often necessary is to exclude the enhancement of red information (from Ha) into stars and other things where not required. Thus the use of starless versions of this Ha information is powerful. 

    4. A slightly more advanced step is to create a continuum subtracted version of the Ha information- this is often be even easier to blend.

    Just some thoughts.
    -the Blockhead
  • starfield
    Thanks, Adam.  Exactly what I was looking for (and am actually in the middle of creating a starless HA version right now.)  This should be a fun exploration and give me something to do during San Diego's annual June gloom.

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