ps2pdf does not preserve dimensions

I am using packages geometry and crop in a .tex file. Then, I convert it to .ps (using dvips) and .pdf (using ps2pdf). The problem is that in the .dvi and .ps files all areas (margins, heights and widths) are ok. However, in the .pdf file they are not. How do I tell ps2pdf to generate a .pdf file with exactly the same dimensions as in the .ps file? I tried different options for ps2pdf but none worked.

documentclass [pagesize=false,listof=totoc,bibliography=totoc,fontsize=10pt,twoside,headings=openright,cleardoublepage=empty,headsepline=off]{scrbook}
usepackage{geometry}
geometry{
    mag=1000,
    paperheight=23.5cm, paperwidth=17.2cm,
    height=19.8cm, width=13.2cm,
    textheight=18.8cm, textwidth=13.2cm,
    headheight=0.5cm, headsep=0.5cm,
    includehead,
    nofoot,
    twoside,
    inner=2.0cm, outer=2.0cm, top=2.0cm, bottom=1.7cm,
    nomarginpar
    }
usepackage[a4,center,cam,noinfo]{crop}
begin {document}
crop
noindent
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