From white to transparent

Jan Öhman <[email protected]>
Newsgroups gmane.comp.video.image-magick.user
Message-ID <[email protected]> 
Hello!

The image has a white background (color?), and I would like to replace 
the white color with transparent color.
(I think it is white :-)  )

Is it possible with ImageMagick?

//Jan
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