Am 21.10.2012 10:04, schrieb Psiweapon:
Is there any way I can directly make a grayscale image into an alpha 
transparency channel?

did you try Colours->Colour to Alpha?

Or, with a layer mask as intermediate step:
  1) Add Layer Mask...   Initialise Layer Mask to: [x] Greyscale copy of layer
  2) Apply Layer Mask


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