# 16 Nov, 2018 10:38
so this is probably me still learning the ropes, but I had the following issue:
I am currently collecting data for M33, first batch was(1h of L/R/G/B each at F5.5). After combing and photometric color calibration of R/G/B, I see clear hints of the various Ha regions, some very strong, some fainter. The image at this stage has a slight green tint. After stretching etc I would then run SCNR (green) - which unfortunately erases most of the Ha signal (except the very strong region).
Any idea why and whether there is anything I could do to avoid that? Is the overall signal just to weak, or am I actually doing something wrong here?
# 16 Nov, 2018 12:34
|Try SCNR after chrominance noise reduction and/or reduce amount of SCNR.|
# 16 Nov, 2018 17:15
MarcAre you using SCNR Green at 100% strength? I usually start at 50% and then undo and try a different value if it seems to be destroying signal rather than just noise. If you still are having trouble you could always apply a stretched, inverted luminance mask first and then use SCNR- it should mostly be working on the sky background anyways.
# 18 Nov, 2018 16:12
|I don't use SCNR if isn't strictly necessary, this eats your data. I prefer neutralize color while be possible.|
# 19 Nov, 2018 06:18
Yes, based on the feedback here, I was able to solve my issue. Ended up using SCNR at 0.7.|
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