Use the select tool to select the white background. If it doesn't select the whole background, decrease its tolerance in options, and/or use contrast to lighten it to a uniform shade. Once the background is selected, go to the selection menu and choose "select inverse." Copy the image. Go to file/new and photoshop will already have the document size to match the selected and copied image. Choose "transparent" background. Paste the image to the new document. Go to file/export and save the image as a gif.
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