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What I mean by "yellow" is a filter that has a bandpass of say 480 - 700nm, and for "purple" I mean a filter that has a rejection band of say 480 - 600nm.
You can roughly estimate a similar process by:
1. Stack all RGB to create a synthetic L
2. Stack all RB to create a synthetic purple
3. Subtract the synthetic purple from the synthetic L
The output of the above operations should match your G stack. You can try it yourself using Pixel math in PixInsight if you have it.
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