Essentially the “alpha” channel was just a hint to our older hardware to say whether alpha is likely to be present or not, but this doesn’t really make a difference any more (In the GUI, the two are no longer distinguished). If you want to empty the alpha channel you should use the “SetChannels” function, to set the float value of the alpha channel to 1.0 globally.
However, saying that, I have had a request for this behaviour before, so I will add it for the 3.3 release of our SDK.
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