Is this normal or am I doing something wrong? When I apply NXT, I get really strange grainy artifacts in the background. It looks like colored specs all over the image (see below).
Doesn’t appear to matter whether I do NXT early in processing on linear data, or near the end on stretched data. And doesn’t seem to matter if I do more or less NXT (I’ve tried 0.35 up to 0.9 denoising and still get these artifacts). I’ve tried messing around with the Version 3 AI settings as well (HF, LF, intensity, color) and haven’t figured out a solution.
Details (let me know if you need more):
Celestron EdgeHD 8
ZWO ASI2600MC
Optolong L-Enhance HaOiii filter (~18 hours)
Altair SiiOiii filter (~28 hrs)
Used DBXtract to create Ha, Sii, Oiii and create an SHO image
Is this just an issue with the data or limitation of dual-band imaging? Or is there a specific method to avoid?
📷 image.png
*Edit: I don’t apply any BXT or NXT until after I combine the 3 channels. Could this also be an issue or should that not matter?
