Re: An empty correspondence with the CEO of Adobe Systems

From	ken <ken@spamcop.net>
Newsgroups	comp.lang.postscript
Subject	Re: An empty correspondence with the CEO of Adobe Systems
Date	2015-03-14 11:50 +0000
Message-ID	<MPG.2f6e30f49082849898e4@usenet.plus.net> (permalink)
References	<efdd5cd9-9a8f-4bc0-9ed3-1a476d7c026d@googlegroups.com> <MPG.2f6e0da85e91b1509898e2@usenet.plus.net> <15318244-a1c5-42c8-8f76-18279a120b03@googlegroups.com> <MPG.2f6e2e5cd3cd92749898e3@usenet.plus.net>

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In article <MPG.2f6e2e5cd3cd92749898e3@usenet.plus.net>, ken@spamcop.net 
says...
> 
> In article <15318244-a1c5-42c8-8f76-18279a120b03@googlegroups.com>, 
> jdawiseman@gmail.com says...
> 
> > > If the settransfer is ignored by Mac Preview, even though its valid, 
> surely this is a problem with Mac Preview, not pdfwrite ?
> >  
> > But Preview heeds the Distiller implementation. See: 
> > https://groups.google.com/forum/#!topic/comp.lang.postscript/NJLAfvN_jwU
> 
> Still, if the transfer function is legal (which I assume it is, since it 
> works in Reader), the fault is in Mac Preview. Without knowing what 
> exactly Mac Preview is doign its kind of hard to 'fix' the bug by 
> altering what pdfwrite produces.

FWIW, you are correct that Distiller is pickling the transfer funtion 
into the colours in the PDF file, while Ghostscript is preserving the 
transfer funtion.

Its surprising how many PDF Readers are unable to handle transfer 
functions, I'm disappointed to see that Mac Preview is among them.

But as I said, this is a bug (or at least a missing feature) in Mac 
Preview. The PDF produced by Ghostscript/pdfwrite is a better 
approximation to the original PostScript than the Distiller output. BTW 
I suspect you must have produced this with Distiller set to 'apply' 
transfer funcxtions, rather than 'preserve'. I feel sure that if you set 
it to 'preserve' you'll see the same behaviour.

It looks like Adobe have changed the default setting of this parameter 
over the years.



			Ken

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An empty correspondence with the CEO of Adobe Systems jdaw1 <jdawiseman@gmail.com> - 2015-03-13 15:47 -0700
  Re: An empty correspondence with the CEO of Adobe Systems tlvp <mPiOsUcB.EtLlLvEp@att.net> - 2015-03-14 04:20 -0400
  Re: An empty correspondence with the CEO of Adobe Systems ken <ken@spamcop.net> - 2015-03-14 09:20 +0000
    Re: An empty correspondence with the CEO of Adobe Systems jdaw1 <jdawiseman@gmail.com> - 2015-03-14 03:08 -0700
      Re: An empty correspondence with the CEO of Adobe Systems ken <ken@spamcop.net> - 2015-03-14 11:39 +0000
        Re: An empty correspondence with the CEO of Adobe Systems ken <ken@spamcop.net> - 2015-03-14 11:50 +0000
          Re: An empty correspondence with the CEO of Adobe Systems rodd@panix.com (Rod Dorman) - 2015-03-16 19:05 +0000
    Re: An empty correspondence with the CEO of Adobe Systems jdaw1 <jdawiseman@gmail.com> - 2015-04-05 14:37 -0700
      Re: An empty correspondence with the CEO of Adobe Systems ken <ken@spamcop.net> - 2015-04-06 08:00 +0100
        Re: An empty correspondence with the CEO of Adobe Systems jdaw1 <jdawiseman@gmail.com> - 2015-04-06 15:51 -0700
          Re: An empty correspondence with the CEO of Adobe Systems ken <ken@spamcop.net> - 2015-04-07 09:03 +0100

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