If you need to know for a pixel, use pdb.gimp_drawable_get_pixel(drawable,x,y) that returns 4 values (if there is an alpha channel). Note that this doesn't take in account the layer mask, if any.
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Can gimp-image-pick-color return Alpha?
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Can gimp-image-pick-color return Alpha? - by Jack Parker - 12-12-2019, 11:13 PM
RE: Can gimp-image-pick-color return Alpha? - by Ofnuts - 12-13-2019, 08:06 AM
RE: Can gimp-image-pick-color return Alpha? - by Jack Parker - 12-15-2019, 06:54 AM
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