bash - ImageMagick: put white background under transparent PNG

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I have a PNG image with a black shape on transparent background. I need a white shape on a solid black background instead. How can I achieve that with Imagemagick? Image example: I have this: I

bash - ImageMagick: put white background under transparent PNG, then invert colors - Stack Overflow

bash - ImageMagick: put white background under transparent PNG, then invert colors - Stack Overflow

bash - ImageMagick: put white background under transparent PNG, then invert colors - Stack Overflow

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bash - ImageMagick: put white background under transparent PNG, then invert colors - Stack Overflow