Ubuntuusers wiki tells me that it will work by adding the parameter "-dPDFA" in /etc/cups/cups-pdf.conf in this line:
Code: Select all
GSCall %s -q -dPDFA -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f %s