PNG resolution [Was: Is there a way to prin in multiple pages?]

[Lars Clausen <lrclause cs uiuc edu>]

On Wed, 29 Jan 2003, ed hunter wrote:
> On Tue, Jan 28, 2003 at 08:35:15AM -0600, Lars Clausen wrote:
> > On Tue, 28 Jan 2003, Leonardo Javier Belén wrote:
> > > In the mean time, a thing that really drives me crazy is the fact
> > > that, when I need to print know the diagram in specially big paper
> > > (using a sort of plotter) I, according with the printer's, need to
> > > give them a raster image, so I try to give them .pngs, in which the
> > > resolution is 96x96, which is clearly unsufficient, so how can I
> > > change that value?.
> >
> > In 0.90, you are asked for the size of the PNG when you export.  Just
> > set this up to however much you need.
>
> I think he means *resolution*. The printers need to know it (or at least 
> are accustomed to think in these terms, which is the same :-)

Oh, I see.  I guess when the size is changed, the resolution ought to
change correspondingly.  The 96x96 resolution is actually just an arbitrary
libpng default that has nothing to do with what we write.  We do 20 DPCM,
i.e. 50 DPI, by default.  We should change the resolution setting to fit
the scaling.  Please file us a bug report so we don't forget.

-Lars

-- 
Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause)| Hårdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?