Note

There is an important difference between two similar MIME types in CUPS: one is application/postscript , the other is application/vnd.cups-postscript . While application/postscript is meant to be device-independent, job options for the file are still outside the PS file content, embedded in command-line or environment variables by CUPS, application/vnd.cups-postscript may have the job options inserted into the PostScript data itself (where applicable). The transformation of the generic PostScript ( application/postscript ) to the device-specific version ( application/vnd.cups-postscript ) is the responsibility of the CUPS pstops filter. pstops uses information contained in the PPD to do the transformation.