Ghostscript ps2pdf Create Cleaned pdf

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http://stackoverflow.com – I have tried and searched all but i didn't get answer for my requirement. Is it possible to create cleaned pdf file from ps2pdf command. I know we can create pdf using this, My requirement is I have existing pdf and i am cropping into some area and i am creating ps file because i want to remove the other objects. When i print the file, it will remove. When i tried below command in my linux cent os ps2pdf -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress a11.ps axd.pdf Objects still remains. Please help me out. (HowTos)