Change your image mode to RGB: Image -> Mode -> RGB
Now you can change white to transparent: Colors -> Color to Alpha...
Change your image mode back to 1-bit: Image -> Mode -> Indexed...

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: GIMP: Indexed (Gif), change white to transparent I have a 1-bit black-and-white GIF, I need to change the white into transparent. How do I do it in GIMP?

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