Background image removal component [closed]

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I'm looking for an API/Library/Component to use in my Django app that takes an image as an input and returns the same im开发者_开发百科age with transparent background. I'm looking for something smarter than ImageMagick's floodfill http://www.imagemagick.org/Usage/channels/#mask_floodfill that detects the color of the background. Any suggestions?

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In PIL you have im.save(filename, transparency=some_palette_index) for mode P images or putalpha method for RGB images.