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color Scaled Tree HaRGB 54 27 24 25



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Kevin Morefield

color Scaled Tree  HaRGB 54 27 24 25

I started shooting this with just narrowband Ha and then started on RGB since the moon was gone. Now way to get more for a while due to clouds so I thought I'd see what I could make of 54 Ha, 27 Red, 24 Green, and 25 Blue subs. (all 10 minute).
I tried lots of different mixes but it looked best using the Ha as the Luminance. Only thing was that it cam out grey since it was so different than all of the color data. But it really made the star pop! So I tried to make synthetic luminance by summing all of the RGB data equally. Then I added that to the Ha 50/50 and used it for the luminance channel in what you see. It allowed a little color to come in to the nebula bits.
If the clouds ever clear I keep shooting OIII and SII and see what happens. But I think I might like this better.
Planewave CDK14, SBIG STX, Paramount ME II. Unguided using the ProTrack Algorithm in T-Point.



    I like it.  The nebula looks like fine linen (colored).  The large stars are a bit funky (colored mini-halos).  I love the blue around the upper star--looks like a OIII exciting giant.  Detail in teh cone is remarkable.  Very unique.

    Photo
    betelgeuse91
    Apr 30 2019 12:25 AM

    The color is absolutely outstanding. Could you explain more in detail how you made the synthetic luminance by summing all of RGB equally? 

    The color is absolutely outstanding. Could you explain more in detail how you made the synthetic luminance by summing all of RGB equally? 

    This has been a while, but to make a synth luminance you take the mean of the channels after you have normalized them.  Normalized means that the black point and white points have been matched up.  I believe this would be done after converting from linear data to non-linear but that distinction may not be clear in some processing programs.   Does that make sense?




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