Re: Image resolution for PDF

Steve,

On 05/04/2008, Jean-Marc van Leerdam <j.m.van.leerdam_at_gmail.com> wrote:
>
> Steve,
>
> On 05/04/2008, Stefan Küng <tortoisesvn_at_gmail.com> wrote:
> >
> > Jean-Marc van Leerdam wrote:
> >
> > > Hi,
> > >
> > > The recent changes to the way the documentation is generated has
> > > resulted in reduced quality images in the PDF version. On screen they look
> > > fine, but printing them results in -- how do I say this nicely -- sub
> > > optimal prints ;-)
> > >
> > > I noticed a commit where all images were reduced to 96dpi and a max
> > > width/height of 500/800. This results in a max effective image width in the
> > > PDF of 5.2 inch (13 cm).
> > >
> >
> > The dpi was not reduced. Most images already had a dpi of 96, but some
> > had one of 72dpi. those were increased to 96 dpi.
>
>
> When setting the dpi to 150 on the .png files, they render much nicer in
> pdf (no other changes needed).
>
> I don't expect this will impact the html and chm rendering, as these use
> the images as they are right?
>
> I can post the TortoiseSVN-1.5.0-en.pdf if you want to see the results.
>
> Images up to 800 pixels wide will fit onto a page if its DPI is set to
> 150.
>
> Isn't it possible to render the images as 200dpi (or 150dpi) in the PDFs?
> > > With a max width of 13 cm, that should allow images of up to 1040 (or 780 at
> > > 150dpi). For printouts that results in much clearer images.
> > >
> > > I would lend a hand in debugging the FOP/Docbook stuff to see where
> > > the image resolution is set. A pointer towards the file(s) to start with
> > > would be great.
> > >
> >
> > If you can find out how to make the pdf generation scale the images to
> > fit the page so they won't get cut off at the right, that would be great. I
> > tried many hours to get this done without success.
>
>
> Scaling oversized images is not available in FOP at the moment. See
> http://xmlgraphics.apache.org/fop/knownissues.html (Other known issues,
> bullit 11: Images currently don't shrink so they fit on a page when they are
> too big and shrinking is allowed to happen).
>

But if we really want to include a larger image, we just have to set it's
DPI to a higher value. That way, the image will fit on the page and still
show the required detail when printing (or by zooming in when viewing the
PDF).

-- 
Regards,
Jean-Marc
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