On Friday 04 May 2007 09:51, John Pye wrote:
> Helge Hafting wrote:
> > John Pye wrote:
> >> Hi all
> >>
> >> I would like to know if there's a way I can easily downsample (or
> >> 'degrade') images in my LyX document when creating output using
> >> pdflatex. I have a mix of PNGs, PDFs, EPS and JPG in my document, but my
> >> PDF file is starting to become large and I'm sure there must be some
> >> too-high resolution images in there. I found the graphics/degrade
> >> package on CTAN but that seems to require that I use ERT for all my
> >> images, which I'd rather avoid.
> >>
> >> If it's not possible from within LyX, perhaps there's a post-processing
> >> tool that someone can recommend: one that does the downsampling of a PDF
> >> file, without killing my hyperlinks and bookmarks, would be what I'd
> >> want.
> >>
> >> Any suggestions?
> >
> > Just look at the size of your image files. Then, downsample
> > the biggest ones. If you want to keep the originals, make new
> > filenames for the downsampled files, and change the document
> > accordingly.
> >
> > Helge Hafting
>
> Hi Helge,
>
> I was really looking for an automated approach. For example on Windows,
> there is 'PDF Factory' (although I haven't tried it with hyperlinks). So
> I was hoping for something similar on Linux.
>
> One reason why an automated approach would be good is that the file can
> be big and appear big on the page: it /needs/ to be big. But if it's big
> and appears /small/ on the page, then it needs to be downsampled.
>
> Another reason: a LyX document can embed PDFs, SVGs, and I imagine other
> 'image' files, that can in turn embed bitmaps. One needs a tool that
> examines the resulting PDF output, rather than the input files.
>
> Cheers JP
If I needed to do this, I would write a program in Ruby, Python or Perl to do
the following:
* Copy your original LyX to another filename.
* Scan the new file for included pictures.
* For each picture:
1. Use imagemagic convert to create a lower resolution copy
2. Change the LyX source to point to the new picture copy
* Export to Latex
* Run pdflatex
Run one command, and your PDF is built with smaller pictures.
HTH
SteveT
Steve Litt
Author: Universal Troubleshooting Process books and courseware
http://www.troubleshooters.com/
