[l2h] grey background for png

[sigbert]

Hi,

we are switching from in the image generation from gif to png. It turns
out that a few math formulas have still a grey background rather than
transparent one. I have set \pagecolor{white} in the l2hconf.pm. Has
anyone observed that behaviour or a solution to it ? I tried also to
generate the transparency by hand, but it did not work (pngtopnm $f |
pnmtopng -transparent #B2B2B2 > $f).

Thanks a lot in advance

	Sigbert

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