• Convert the original image to png
    convert Marie_Mamiya_Mistress.jpeg Marie_Mamiya_Mistress.png
  • Use fuzz option to calibrate the transparent background avoiding to remove some white area to keep
    convert Marie_Mamiya_Mistress.png -fuzz 2% -transparent white Marie_Mamiya_Mistress_Transparent.png
    

Original PNG file (White background)

Modified PNG file (Transparent background)