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I have an Image, and I want to change anything that isn't transparent into black.

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  1. Select black as the foreground colour (or press D to set default colours: black foreground, and white background)

  2. Make sure you have the correct layer select in the Layers panel, then select Lock alpha channel

enter image description here

  1. Do Edit > Fill with FG color, or use the shortcut Ctrl+,

enter image description here

Obviously, once you've finished, unlock the alpha channel if you want to edit the transparent areas again.

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