PostScript files settings seem to have a higher priority than pdfcreator settings

Hello everybody,

When creating a PDF from a Postscript file, compression settings used seem to be compression settings included in the Postscript file. Compression settings of Pdfcreator are ignored. Do someone knows how force Pdfcreator to use his own settings instead them included in the Postcript file ? Maybe with a Ghostscript command line parameter...

Thank you for your help