[Orgmode] Change resolution of LaTeX formulas in HTML output?

[amscopub-mail]

Is there a way to control the resolution of PNG LaTeX formulas when you export 
to HTML?

You can control the font size directly in the header but there doesn't seem to 
be a way to use org-mode to control the resolution...

BTW, I'm not exporting to LaTeX directly because I'm using PrinceXML to convert 
the HTML file to a PDF.

--Uriel