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Re: 100% black, as required by a book printer

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Ken,

Thank you. That is a very long reply, the detail of which will be the subject of experiments. 

To answer your questions: 
• My text comes in only two colours: red and black. 
• Many of the “700 pictures” are black-and-grey; but many are full-colour PNGs, some with edge patches of transparency. I know that the colours will print imperfectly: in most cases (e.g., pictures of pages of old cellar books) this won’t be important.

The 600dpi bothers me. Pictures, having been cropped, are of all kinds of original pixel dimensions. In the document they have scaled to be, typically, 3″ across. Your observation explains why Adobe Pro shows that there are only a few distinct picture resolutions in the PDF. Somehow I need to persuade Word to print every picture at its full maximum resolution, because two resolution changes (Word, then printer) would damage print quality. 

No trouble at all. 


Your cute little preamble can become one line, slightly shortened, and then lengthened to be robust against being multiply prefixed (oops!):

/setcolor load type /operatortype eq {/setcolor {3 copy 0 eq exch 0 eq and exch 0 eq and {1 setcmykcolor} {setrgbcolor} ifelse} bind def} if

which, with a “%!PS”, can very easily be cat’ted to the start of the PostScript. And, in my 4½GiB PostScript file, it works! (Should setrgbcolor be similarly redefined?) 

For experiment, I’ve uploaded a page with two fairly typical pictures 
http://www.jdawiseman.com/2017/20170731_PortVintages_SW1945.ps
and removed the previous file.

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100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-07-30 05:42 -0700
  Re: 100% black, as required by a book printer Martin Leese <please@see.Web.for.e-mail.INVALID> - 2017-07-30 08:24 -0600
    Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-07-30 12:31 -0700
      Re: 100% black, as required by a book printer luser droog <luser.droog@gmail.com> - 2017-07-30 15:47 -0700
  Re: 100% black, as required by a book printer Carlos <carlos@cvkm.cz> - 2017-07-30 19:37 +0200
  Re: 100% black, as required by a book printer ken <ken@spamcop.net> - 2017-07-31 08:58 +0100
    Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-07-31 14:37 -0700
      Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-08-02 12:15 -0700
        Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-08-29 15:15 -0700
          Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-08-31 09:36 -0700
            Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-11-13 14:16 -0800
              Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-11-14 15:02 -0800
                Re: 100% black, as required by a book printer jdaw1 <jdawiseman@gmail.com> - 2017-11-16 15:57 -0800

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