Now for the main event. We are going to combine the Luminance (L) image with the RGB image you just created.
Lightness Settings:
Apply the process to your target image.
The Result: You should now see a significant increase in detail and contrast compared to your original RGB image. pixinsight lerar link
LN can slightly amplify noise in high-gradient areas. Use MultiscaleLinearTransform (MLT) or NoiseXTerminator on the linear image before stretching. Now for the main event
PixInsight is the gold standard for serious astrophotography processing. Lightness Settings: