I have been working on my M27.
- 19x 300" subs
- ASI071MC Pro at -10°C
- EdgeHD-8 with 0.7x reducer
- ZWO OAG with ASI174MM mini guider.
Processing is done in PI.
Using STF, slightly dialed back, and various contrast enhancements and noise reductions I get this. Stars are pretty white, but I have some nice detail in the middle IMHO.
Using ArcsinhStretch I get the pic below. The star in the middle is a blueish white dwarf, and the color reflects that. But the red stuff which I assume is Ha is quite orange.
So ... what is the correct color for this nebula? I like the nebula color more in the first pic, and the star colors more in the second pic.
Back when I used a DSLR I used rnc-color-stretch and always loved the colors. But rnc-color-stretch does not like the super low ADUs that the sky is when using a cooled camera.
I put the cropped stack in a DropBox in case anyone has the time and skills to take a crack at this to pull out the best color possible.
Edited by t-ara-fan, 17 September 2019 - 12:44 AM.