This was an experiment to try out
@Tim Hutchison 's method to create true(er) color with narrowband data. The nights are short, so I don't have a ton of data, but it turned out well enough. I think it will be worthwhile to try his method on other targets in the future.
Big thanks to Tim for coming up with this. His presentation about it is here.
https://www.youtube.com/live/cu76vNPq4TcThere's also a video from "Deep Sky Detail" about the pixel math needed in Siril here.
https://www.youtube.com/watch?v=4uUS3vcghiYThe difference in Siril is because the "max" function only takes two parameters. The calls just need to be stacked to come up with the same results.
QHY's chart for the 533 is here.
https://www.qhyccd.com/wp-content/uploads/20220411218-1536x750.jpgMy values were a bit off because I read the chart with bad eyes. I will use these corrected values for the QHY533 next time.
qeSII=0.54, qeHa=0.58, qeOIII=0.9
I used SCNR and also tweaked the colors in stretching... and then again a little bit in RawTherapee. Tim's method was just a good starting point.
I used a little GraXpert noise reduction AFTER stretching and recombining the narrowband nebula with RGB stars. This seemed to work well enough even though GraXpert was trained on linear data.
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