You have a type pseudocolor image with transparency. This works for 
me to keep the png the same pseudocolor with transparency.

convert powerlogo.gif PNG8:powerlogo.png

or to convert to 32bit (RGBA)

convert powerlogo.gif PNG32:powerlogo.png


The default convert to png is equivalent to PNG24 (24-bit RGB no alpha)


see http://www.imagemagick.org/Usage/formats/#png_formats






>Hi there,
>
>I hope to convert powerlogo.gif
>(http://www.freebsd.org/gifs/powerlogo.gif) from gif format to png
>format. However, the transparency in gif figure lost.
>
>I just used:
>  convert powerlogo.gif powerlogo.png
>
>any suggestions? Thanks
>Jinsong
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