Took a go at processing the Horsehead nebula (IC 434) but the part meant to be Red ended up as yellow. I use Siril & my workflow is as such-
AutoStretch view
Green Noise Removal
Background Extraction
Starmask & Starless generation
Linear view
Stretches - ASinh → Hyperbolic → Curves
Recompostion
Finishing
Any ideas on how to make it more natural?
Rangerdanger12629r · Sep 30, 2025 at 03:24 AM
Took a go at processing the Horsehead nebula (IC 434) but the part meant to be Red ended up as yellow. I use Siril & my workflow is as such-
AutoStretch view
Green Noise Removal
Background Extraction
Starmask & Starless generation
Linear view
Stretches - ASinh → Hyperbolic → Curves
Recompostion
FinishingAny ideas on how to make it more natural?
Have you tried doing a background extraction before removing green noise? Also, what filters are you using?
none
Rangerdanger12629r · Sep 30, 2025 at 04:23 AM
none
Are you manually color calibrating the data? If so, make sure you selecting areas in the background that doesn’t contain stars for background neutralization. For a test, you could always use SPCC to see what Siri produces and compare the results to yours.
Rangerdanger12629r · Sep 30, 2025, 03:24 AM
Took a go at processing the Horsehead nebula (IC 434) but the part meant to be Red ended up as yellow. I use Siril & my workflow is as such-
AutoStretch view
Green Noise Removal
Background Extraction
Starmask & Starless generation
Linear view
Stretches - ASinh → Hyperbolic → Curves
Recompostion
FinishingAny ideas on how to make it more natural?
Try this just so you can convince yourself that you have good color data:
AutoStretch
Plate Solve
Color calibration SPCC (average galaxy reference)
At this point you should be pretty well color balanced or at least show you the color you have. I have no idea about the quality of your data.
Tony Gondola · Sep 30, 2025 at 12:58 PM
Rangerdanger12629r · Sep 30, 2025, 03:24 AM
Took a go at processing the Horsehead nebula (IC 434) but the part meant to be Red ended up as yellow. I use Siril & my workflow is as such-
AutoStretch view
Green Noise Removal
Background Extraction
Starmask & Starless generation
Linear view
Stretches - ASinh → Hyperbolic → Curves
Recompostion
FinishingAny ideas on how to make it more natural?
Try this just so you can convince yourself that you have good color data:
AutoStretch
Plate Solve
Color calibration SPCC (average galaxy reference)
At this point you should be pretty well color balanced or at least show you the color you have. I have no idea about the quality of your data.
Yes, I also forgot to mention plate solving! Make sure you have plate solved your image.
I’ll give a go & post in say 16 hrs
I forgot to mention that although removing green noise is a standard move for a lot people you shouldn’t do it as it apparently destroys useful data. Using SPCC will take of the green and any that’s left is usually from LP.
I can’t do SPCC as the data isn’t mine & I don’t know the filters but I did PCC & the Red is visible📷 image.png
ok did it!
Great!