PixelMath without PixInsight - for free!
The PixelMath tool in PixInsight is amazing and can do crazy things, like ForaxX's excellent narrowband combination method - but yes, it does require PixInsight. Or does it? Let's do some PixelMath, with just free software!
ForaXx's NB combination: https://thecoldestnights.com/2020/06/...
ImageMagick: https://imagemagick.org/
Formula for NB combination:
magick OIII.tif Ha.tif SII.tif -fx "(u^(1-u))*u[2] + (1-(u^(1-u)))*v" R.tif
magick OIII.tif Ha.tif -fx "(u*v)^(1-u*v)*v + (1-((u*v)^(1-u*v)))*u" G.tif
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