[OS X TeX] texshop, xetex, and transparency

[Theo Moore]

I've been unable to get the transparency option working using xetex. The
code compiles, and everything is fine, except that the letters rendered are
simply not transparent. Any ideas why? Here is a minimal example:

\documentclass[11pt]{article}
\usepackage{xunicode}
\usepackage{xltxtra}
\defaultfontfeatures{Mapping=tex-text}
\usepackage{fontspec, graphicx}
\usepackage[dvipdfm, colorlinks, breaklinks}

\begin{document}
\thispagestyle{empty}
{\fontsize{12}{12}
\fontspec{HoeflerText-Italic}
{\addfontfeature{Color=00FF0044, Scale=4, Alternate=1}Q}\kern-4ex
{\addfontfeature{Color=FF000033, Scale=8, Alternate=1}Q}\kern-8ex
{\addfontfeature{Color=0000FF22, Scale=16, Alternate=1}Q}\kern-16ex
}

\end{document}
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