How to replace white background color with transparent of an image in ImageMagick?

Question

I have an image in .jpg format with white background color. I want to remove the white background color to transparent in Imagemagick.

Answer 1

This is my solution without magicwand (replace magick by convert for im < 7.0):

magick img.png -fuzz 20% -fill none -draw "alpha 1x1 floodfill" result.png