Converting SVG images to PNG with transparent background

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(Apologies if this is a duplicate; had some issues with subscription)

Hello!

For some time I've been using the following command to convert my SVG
icons to PNG-with-transparency:

convert -background none $x -size 48 in.svg out.png

This resulted in a smooth image with interpolated alpha channel like
in the example below:

http://cobra.ru/zap/about-im.png

(best viewed with programs like GIMP or GQVIEW which display a
checkerboard pattern as background).

Now for some reasons I'm trying to switch to GraphicsMagick. The
command line above worked without problems, however it resulted in
something like a 1-bit alpha channel (pixels are either absolutely
transparent or absolutely opaque), like in the result below:

http://cobra.ru/zap/about-gm.png

Is there something I can do about it?

--=20
Greetings,
   Andrew

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