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Glenn,
As you using a OSC narrowband filter your capturing Ha and Oiii at 7nm bandwidth ( Not RGB broadband)
Also M20 Trifid is primarily a Broadband target so best to image it during the new moon period with just a luminance filter or UV/ IR cut filter , not an L Extreme filter
Here’s an “example only” of how I process Emission Nebula targets like M42, M8 , Carina , M16 , M17 and so ….with my OSC camera and L Extreme filter using Startools
Compose OSC Bi Colour Images for Emission , Reflection and Planetary Nebula using L Extreme filter
Open Startools and use “Compose” to load data set
Select Luminance Colour - L+Synthetic L from R (2xG ) B, R ( GB) (GB) ( Bi Colour from OSC DSLR )
Load your data set into
R / S11
Green / Ha
Blue /Oiii
Leave Luminance file None
Color Channel Interpolation On
Channel sliders are set to default or 1hr 3600sec ( no need to adjust )
When loaded press Keep , then choose Linear
Start your normal workflow in Synthetic Luminance or Mono until you hit the Colour module
Colour Module
Style Scientific ( Colour Constancy )
Saturation Amount 180% to 250%
Bright Saturation + 2.0 to taste
Dark Saturation + 2.0 to taste
LRGB Emulation Try both RGB Ratio CIELab Luminance Retention and Straight CIELab Luminance Retention
Bias Slider Mode - Sliders Reduce Color Bias
Red Bias 2.0 to 3.0
Green Bias 3.00 to 4.00
Blue Bias 1.20 to 1.60
The above settings are only a guide. Green bias must be reduced and Blue bias increased to obtain a good Bi Color image. Adjust as necessary.
The above should result in a good Bi Colour image when using the SHO Options in the Matrix at the bottom right
Generally for HOO , HHO, OOH options in the Matrix , reduce the Red bias, increase the Green bias and leave the Blue bias similar to SHO options.
For Interpolate and RGB options in the Matrix , again adjust the Red bias and Green bias to taste. Normally the Blue bias can remain between 1.20 to 1.60
You can still use your M20 L Extreme data set using the above procedures however the colours will be less than ideal
Maybe try M20 again during the dark period ( No L Extreme filter just a luminance or UV/IR cut filter and process with Startools just with Open and centre button OSC data Bayered and not white balanced ( not Compose ) I think you will find results to be far superior than this session
Hope the above helps in some way
Cheers
Martin
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