[tex4ht] disable dvipng on preexistent png images?

[Giuseppe Pica]

Hi,

I'm using MinkTex 2.9 on Windows.

After some upgrades, I've a problem during htlatex compiling.

It seems that dvipng also wants convert already existing png images...

Also, during the conversion I get this warning: *dvipng warning: at 
(20,732) unimplemented \special{em: graph 
icons/pcore/project_criterion.png,72bp,72bp} ] *

on all png images.

Any suggestions?

Thanks in advance.

-j


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