Erase Masking: A Totally Adjustable, Live Mask

Masks in Affinity Photo can be edited to some extent, but are limited when you want to do complex adjustments to them. Here's a way of using any layer as a mask that can be edited live, even using something like Curves with it.

Erase masking creates masks using opacity (or 'alpha'). This means you can use such as:
.. Erase brush
.. Gradients (fade from any colour to zero opacity)
.. Blend Ranges
.. Procedural Texture code (set A)
.. Apply Image formulae (set DA)

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