Save only layer mask in Gimp [closed] - layer

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I've created a layer mask on an image in Gimp.
How can I just save just the layer map as a png?
Thanks

If you are using GIMP interactively, just have the layer mask selected as active drawable as you choose file save - select to save as .png or other file format of your choice (but .xcf).
If you are writing a plug-in using the procedure database, the gimp_file_save function takes a drawable as a parameter - this drawable should be your layer mask.

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