[NTG-pdftex] Re: Slow PNG inclusion with pdfLaTeX

Hartmut Henkel hartmut_henkel at gmx.de
Sun Feb 27 17:09:13 CET 2005

Hi Taco,

On Sun, 27 Feb 2005, Taco Hoekwater wrote:

> I saw this on c.t.t. Shall I attempt a merge of yours and my patches?

oh yes, that would be very nice! The reason why i hesitated with this
patch is that it's not clear to me whether the libpng internally does
any color transforms or other RGB number tweaking during decompression,
maybe driven by some special PNG chunks in the image file. The fast
reading patch would ignore these chunks. But until now i couldn't verify
that libpng would do such calculations at all. Likely not; then the
patch would be safe.

Regards, Hartmut

> Hartmut Henkel wrote:
> > <remolinero at hotmail.com> wrote:
> >
> > > I need to put a lot of PNG pictures in a tex document. But
> > > including PNGs makes pdfLaTeX to hang a few seconds after
> > > including each PNG. This doen't happens with other file types as
> > > JPG, PDF, etc.
> > >
> > > Is there a way to ommit this delay? Without converting all PNGs to
> > > other format?
> >
> > If you compile from source, maybe check
> >
> > http://www.circuitwizard.de/pdftex/patch5
> >
> > which should read much faster, if the PNG files are of the right
> > type. The problem with this rough patch is that it's now getting
> > obsolete as it doesn't (yet) support new transparency features to
> > come.

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