Quoting Norman Silverstone <nor...@littletank.org>:
> Suppose there are three different layers in a stack that need to be
> saved individually and then used as the input for a RPI plugin. What
> would be the best procedure to use, please?
Make the layer you wish to save active by clicking on its thumbnail
preview in the Layers Dialog, then from the File Menu select the "Save
As" item. Give your filename a ".png" extension.
Since the PNG format does not support multi-layer images, you will be
presented with an Export Dialog which asks whether you want to Flatten
your image or Merge its layers; you want to do neither so click on the
"Ignore" button and just the active layer will be saved.
Repeat the process for the other layers.
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