The best way to obtain a pdf with transparent background

[dango]

Hello. Which is the best way to obtain a pdf with transparent background starting from a single .png image? I type from command line (the image stands on a white background):

Code: Select all

convert -transparent white image.png image.pdf

Is this the right way to procede? Is there any other thing or option to use?
Thanks for your help.

[anthony]

That will only make pure white transparent. It will leave a white halo around everything.

There are a couple of different methods. See IM examples, postscript to image
http://www.imagemagick.org/Usage/text/#postscript
for the basic methods.