Convert PDF to PS in Ghostscript and preserve CMYK split -


i have rgb pdf i've preflighted in adobe acrobat pro pdf x1a compliant pdf in web coated swop v2.

the pdf has 4 plates (c/m/y/k)

c plate empty m plate has 100% of red image y plate has 100% of same red image k plate has 100% of black text on page (text not on other plate)

i'm trying convert pdf ps using ghostscript

i've tried:

gs -dnopause -dbatch -sdevice=ps2write -sprocesscolormodel=devicecmyk -soutputfile=output.ps input.pdf

but when distill ps pdf text on plates , not k plate.

i've used online tool: http://pdf.my-addr.com/free-online-pdf-to-ps-convert.php

to conversion , distilled version of ps generated preserves plate breakdown. using ghostscript create ps.

so i'm assuming there setting missing.

does know?

update 1

trying in pdftops , again taking k plate , spreading across cmyk plates.

what secret magic doing on web site preserve plates?!

update 2

only main difference can see i'm using

%%creator: gpl ghostscript 905 (pswrite)

and website using

%%creator: gpl ghostscript 871 (pswrite)

could version thing, or doing i'm not?

ghostscript 9 , above use much better colour management previous versions, but have icc profiles correct. i'd guess using default profiles , think first thing i'd suggest use current version of ghostscript 9.07, think there few changes made default profiles.

its possible pdf file has input rgb profile associated it, ghostscript using whereas didn't. i'd need see file able tell better going on, have sneaky suspicion 'pre-flight' conversion causing problem. happens if use original pdf file ?

i doubt if pdf file contains cmyk colour components, imagine has happened different profiles have been inserted file control conversion rgb cie , cie cmyk.

in passing, don't use pswrite. terrible low-level output converts of content images. produces large postscript processes , doesn't scale (ie if printer different resolution). use ps2write device instead.

by way, since you've used acrobat, why don't use 'save as' postscript there ?


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