ruby - RMagick remove white background from image and make it transparent - Stack Overflow

I need to remove the white background from this image and make the background transparent. So it's just a black tick on the transparent background exported as a png. e.g. Turn Into Any ideas?

ruby - RMagick: How to check if all pixels in a particular area of the image are transparent? - Stack Overflow

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ruby - RMagick remove white background from image and make it transparent - Stack Overflow