The script extracts the preamble of the document and runs all

\begin{postscript}...\end{postscript}

• \begin{pspicture}...\end{pspicture} and
• \pspicture...\endpspicture

separately through LaTeX with the same preamble as the original document; thus it creates EPS, PNG and PDF files of these snippets. In a final PDFLaTeX run the script replaces the environments with \includegraphics to include the processed snippets.

Detail documentation is acquired from the document itself via Perldoc.