How to Select Colours Using the HSL Wheel in Affinity Photo

The HSL control in Affinity Photo has a neat colour wheel selection method. It would be nice if this was available as a general colour selection tool, but (as of recording this) is not implemented. So I thought I'd find a way of doing this, along with adding a few other tweaks.

Formulas you can cut/paste to use in the Procedural Texture layer include:
Basic selection: max(R,G,B)-min(R,G,B)
Stronger selection: (max(R,G,B)-min(R,G,B))/max(R,G,B)
Strongest selection: roundup((max(R,G,B)-min(R,G,B))/max(R,G,B))

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Видео How to Select Colours Using the HSL Wheel in Affinity Photo канала InAffinity for Affinity Photo