Bug in Max (RGB Math)

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Help on Min states: The alpha channel is not processed in a channel-wise manner – the resulting alpha channel is taken from the Source A input.

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Help on Max states: The alpha channel is not processed in a channel-wise manner – the resulting alpha channel is taken from the Source A input.

Notice how the outer area is a combination of both sources...

EDIT: actually there is something wrong in Min too (according to what the help states) - did you change them to process all channels the same way? (which is great if you did.. then the help file just needs an update)

Actually it would be great if more of the math components processed alpha just as RGB. And negative/HDR alpha support please

Exactly the same as negative R,G and B .. thats precisely the point - currently alpha is clipped to range 0..1 which is mighty annoying when you use the channels for general purposes.

Its not really that alpha should be negative - the alpha channel should be HDR (and implicitly support negative ranges).

You can argue that alpha outside the 0..1 range doesn't make sense (when blending etc), but that argument applies to RGB as well - you can't "see" values outside the 0..1 range. However you can work with values outside that range in temporary calculations etc, which in the end can produce valid ranges - that applies to alpha too.

Components that require a specific alpha range (like blend) could simply clip the range when required. A great deal of all the components don't care what range alpha is, so there is no need to clip alpha here really. No different from how it works with RGB..

Who are these testers and how do I become one?

Help says:

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The Min component performs the channel-wise selection of the minimum color from the colors supplied by the Source A and Source B inputs. The alpha channel is not processed in a channel-wise manner – the resulting alpha channel is taken from the Source A input. The Max component performs the channel-wise selection of the maximum color from the colors supplied by the Source A and Source B inputs. The alpha channel is not processed in a channel-wise manner – the resulting alpha channel is taken from the Source A input.

..when it really should say:

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The [Min/Max] component performs the channel-wise selection of the [minimum/maximum] channel from the channels supplied by the Source A and Source B inputs. The alpha channel is processed in the same manner as Red, Green and Blue.

Proof: