Re: PDF: multiple slides per page to one slide per page?

From	ken <ken@spamcop.net>
Newsgroups	comp.lang.postscript
Subject	Re: PDF: multiple slides per page to one slide per page?
Date	2011-06-23 07:56 +0100
Message-ID	<MPG.286cf3d91ef102fb98984b@usenet.plus.net> (permalink)
References	<7d554826-c2b6-4dff-a363-8e8bf16c6798@r19g2000prm.googlegroups.com> <c77a1a8a-0af4-4c15-a503-8688f05f4335@l36g2000vbp.googlegroups.com> <49e8cf9b-1625-462f-b3dd-eddfec9dfd66@y7g2000prk.googlegroups.com> <1d724167-c700-4c97-809e-db7ffa3d23d3@r33g2000prh.googlegroups.com>

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In article <1d724167-c700-4c97-809e-db7ffa3d23d3
@r33g2000prh.googlegroups.com>, dmathog@gmail.com says...
> 
> On Jun 21, 3:03 pm, David Mathog <dmat...@gmail.com> wrote:
> 
> >
> > The only thing I can't quite figure out is why the quality of images
> > degrades.
> 
> Here are two screen dumps taken at (about) the same resolution showing
> the image
> degradation:
> 
> http://saf.bio.caltech.edu/pub/pickup/platonic_original.PNG
> http://saf.bio.caltech.edu/pub/pickup/platonic_flate.PNG

I don't see image 'degradation', the shapes of the letters look the 
same. What I do see is a difference in the colours of the pixels, which 
suggests either a decoding difference (the image looks to have been a 
JPEG initially), or a difference in colour conversion.

Colour conversion should not be taking place for a PDF output, so the 
most likely difference is something to do with JPEG decoding.

You could try using Ghostscript to render the originsal PDF file to CMYK 
and RGB, and look at the output to see if the result looks the same.

You haven't said which version of Ghostscript you are using either, if 
you are using an older version you could try upgrading. 

			Ken

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Re: PDF: multiple slides per page to one slide per page? pipitas <pipitas@googlemail.com> - 2011-04-25 04:35 -0700
  Re: PDF: multiple slides per page to one slide per page? pipitas <pipitas@googlemail.com> - 2011-04-25 05:55 -0700
  Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-21 15:03 -0700
    Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-22 15:35 -0700
      Re: PDF: multiple slides per page to one slide per page? ken <ken@spamcop.net> - 2011-06-23 07:56 +0100
        Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-23 13:56 -0700
          Re: PDF: multiple slides per page to one slide per page? ken <ken@spamcop.net> - 2011-06-24 07:57 +0100
            Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-24 09:33 -0700
              Re: PDF: multiple slides per page to one slide per page? ken <ken@spamcop.net> - 2011-06-24 20:05 +0100
              Re: PDF: multiple slides per page to one slide per page? ken <ken@spamcop.net> - 2011-06-25 11:51 +0100
                Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-27 10:21 -0700
                Re: PDF: multiple slides per page to one slide per page? ken <ken@spamcop.net> - 2011-06-28 08:08 +0100
                Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-27 10:33 -0700
                Re: PDF: multiple slides per page to one slide per page? David Mathog <dmathog@gmail.com> - 2011-06-28 09:22 -0700
                Re: PDF: multiple slides per page to one slide per page? mathog <dmathog@gmail.com> - 2011-06-30 10:34 -0700
                Re: PDF: multiple slides per page to one slide per page? tlvp <tPlOvUpBErLeLsEs@hotmail.com> - 2011-06-30 23:25 -0400

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