Re: Ghostscript pickling settransfer

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From	Carlos <angus@quovadis.com.ar>
Newsgroups	comp.lang.postscript
Subject	Re: Ghostscript pickling settransfer
Date	Fri, 15 May 2015 19:45:02 +0200
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[ken <ken@spamcop.net>, 2015-05-15 15:37]
> In article <db2c3a8f-f4a3-4624-824b-11aeeca3fab4@googlegroups.com>, 
> jdawiseman@gmail.com says...
> > 
> > I have just discovered, in 'Adobe Acrobat 7.0.5 Acrobat Distiller
> > Parameters, 2 Oct 2005', page 92, the parameter
> > TransferFunctionInfo. 
> > > Determines how Distiller handles transfer functions, which are
> > > traditionally used to compensate for dot gain or dot loss that
> > > may occur when an image is transferred to film. For example, a
> > > file that is intended for output on a particular imagesetter may
> > > contain transfer functions that compensate for the dot gain
> > > inherent with that printer.  Valid values are: Preserve Distiller
> > > preserves (passes into the PDF file) transfer functions. Remove
> > [...]
> > > Apply
> > > Distiller uses the transfer function to modify the data it writes
> > > to the PDF file, instead of writing the transfer function itself
> > > to the file. This value is ignored by Distiller 4.0 but supported
> > > by Distiller 5.0 and later. It is sometimes used to achieve
> > > artistic effects (although the PostScript Language Reference
> > > discourages such usage).
> > 
> > Apply seems to be 'Pickle'. Hurray! Does Ghostscript heed
> > TransferFunctionInfo?
>  
> That's the same as setting it from the Distiller user interface.
> 
> So the answer is still 'No', the pdfwrite device always writes
> transfer functions into the grpahcs state, it never applies them.

Maybe need to change the documentation then...

http://www.ghostscript.com/doc/9.16/Ps2pdf.htm#note_4

Btw, Ghostscript does apply the transfer function when writing to
another vector based format, Microsoft's XPS (the driver is incomplete
in other respects tho).

C.
--

Thread

Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-04-14 14:01 -0700
  Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-04-15 08:15 +0100
    Re: Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-04-15 01:45 -0700
      Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-04-15 10:04 +0100
        Re: Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-04-17 01:35 -0700
          Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-04-17 10:07 +0100
            Re: Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-04-18 02:01 -0700
              Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-04-18 11:23 +0100
                Re: Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-04-25 15:06 -0700
                Re: Ghostscript pickling settransfer jdaw1 <jdawiseman@gmail.com> - 2015-05-15 06:37 -0700
                Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-05-15 15:37 +0100
                Re: Ghostscript pickling settransfer Carlos <angus@quovadis.com.ar> - 2015-05-15 19:45 +0200
                Re: Ghostscript pickling settransfer ken <ken@spamcop.net> - 2015-05-16 09:03 +0100

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