>> I found out that I can do "Layer -> Add Mask", then
>> paint (eg using gradients, with "multiply" ) and then
>> do "Layer -> Apply Mask" which gives me the desired
>> /visual/ result, but I would like to apply the mask
>> to the /alpha/ channel and not to the /r/g/b/ channels.
>> How would I do this?
> where the layer mask is white, there is no transparency.  where it is
> black it is transparent.  gray produces semi transparency.  try by
> adding a white layer mask, select an area on it and fill that with
> black.  paint a black to white gradient on the mask and it will be
> transparent to opague according to how you painted the gradient.
> carol

The erasor does indeed draw into the alpha channel...
With the 'layer mask' I can indeed to the transparency,
but I do not see how I can get it into the alpha channel...

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