I'm using a GraphicsMagick package for image processing
When converting Illustrator (.ai) files to .png files, I end up losing transparency so the background ends up white.
I don't have this problem when using the same options and converting with ImageMagick, but I need a solution to make it work with GraphicsMagick specifically.
I don't have much experience with GraphicsMagick, but I would assume that the behavior of -background is the same as ImageMagick's:
gm convert -background transparent source.ai out.png
Note: This works by defining the background before reading the vector graphic