How do I remove white jagged edges after making image transparent?

How do I remove white jagged edges after making image transparent? Is there a feature to help out with this?

It's a file format limitation. GIF supports 1 bit of transparency. That is 2^1 (which equals 2 total) levels of transparency. This equates to either NO transparency at all, or specifying 1 single color of the 256 total possible values to being fully transparent.
This will leave a very ugly fringe around the edge no matter what; it will only not be visible in color that match or are close to the fringe color; and then, that's a perception issue.
Try creating an alpha channel and saving the image as a PNG. That supports 8 bits of transparency, which equals 2^8 or 256 total different levels of transparency. This will let your image have very smooth edges with no jagged transitions.

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How do I remove white jagged edges after making image transparent?

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