R help - Nov 2003 - howto improve sharpeness of fonts in a jpg-image produced by R ?

Hi.
I've done a standard barplotexample using R1-8.0, redhat8, probably using a 
GhostScript-integration.

How can I improve the "sharpness" of the fonts.
See for example the barplot (originally jpg coming from R) which is part of 
this screendump:
http://www.zug.dk/Members/Nielssteenkrogh/1067525916309553166/element_103003161029

I'm not sure where to improve the this. Is it an R-issue or an 
GhostScript-issue or?

/Niels

Cand. Polit.
Niels Steen Krogh
Solsortvej 44
2000 F.

Tlf: 3888 8613

ZiteLab / EmpoweR youR data with R, Zope and SOAP

_________________________________________________________________
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There are two ways to make jpgs in R: which did you use?

If you want a sharp image, why are you using a format designed for 
photographic images?

I suspect your viewer: that example seems as sharp as I would expect 
viewed in a high-quality JPEG viewer on my LCD screen.

On Tue, 18 Nov 2003, Niels Steen Krogh wrote:
> Hi.
> I've done a standard barplotexample using R1-8.0, redhat8, probably
using a
> GhostScript-integration.
> 
> How can I improve the "sharpness" of the fonts.
> See for example the barplot (originally jpg coming from R) which is part of
> this screendump:
>
http://www.zug.dk/Members/Nielssteenkrogh/1067525916309553166/element_103003161029
> 
> I'm not sure where to improve the this. Is it an R-issue or an 
> GhostScript-issue or?
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

On Tue, 2003-11-18 at 07:45, Niels Steen Krogh wrote:
> Hi.
> I've done a standard barplotexample using R1-8.0, redhat8, probably
using a
> GhostScript-integration.
> 
> How can I improve the "sharpness" of the fonts.
> See for example the barplot (originally jpg coming from R) which is part of
> this screendump:
>
http://www.zug.dk/Members/Nielssteenkrogh/1067525916309553166/element_103003161029
> 
> I'm not sure where to improve the this. Is it an R-issue or an 
> GhostScript-issue or?
> 
> /Niels

In general for fonts, using bitmapped image formats are not the best way
to go since they cannot result in "smooth" curves.

Depending upon how you plan to actually use the images, PS/EPS/PDF
vector based image formats would yield higher quality images and fonts.

Be aware also that bitmapped images do not resize well, which is another
limitation of that format.

HTH,

Marc Schwartz

I used an expression like this:

bitmap(file="barplotx.jpg",type="jpeg")
barplot(c(1,2,3),c(3,4,5),main=list("Death Rates in Virginia", font =
1))
dev.off()


My question:  How can I improve the sharpeness of the text "Death Rates in 
Virginia".
Why jpeg: Its part of a web-environment using R through a SOAP-server. I 
also tried png256, jpeggray and others, but the text "Death Rates in 
Virginia" does not change sharpeness.


/Niels





Cand. Polit.
Niels Steen Krogh
Solsortvej 44
2000 F.

Tlf: 3888 8613

ZiteLab / EmpoweR youR data with R, Zope and SOAP



>From: Prof Brian Ripley <ripley at stats.ox.ac.uk>
>To: Niels Steen Krogh <nielssteenkrogh at hotmail.com>
>CC: r-help at stat.math.ethz.ch
>Subject: Re: [R] howto improve sharpeness of fonts in a jpg-image produced 
>by R ?
>Date: Tue, 18 Nov 2003 14:11:20 +0000 (GMT)
>
>There are two ways to make jpgs in R: which did you use?
>
>If you want a sharp image, why are you using a format designed for
>photographic images?
>
>I suspect your viewer: that example seems as sharp as I would expect
>viewed in a high-quality JPEG viewer on my LCD screen.
>
>On Tue, 18 Nov 2003, Niels Steen Krogh wrote:
>
> > Hi.
> > I've done a standard barplotexample using R1-8.0, redhat8,
probably
>using a
> > GhostScript-integration.
> >
> > How can I improve the "sharpness" of the fonts.
> > See for example the barplot (originally jpg coming from R) which is
part
>of
> > this screendump:
> > 
>http://www.zug.dk/Members/Nielssteenkrogh/1067525916309553166/element_103003161029
> >
> > I'm not sure where to improve the this. Is it an R-issue or an
> > GhostScript-issue or?
>
>--
>Brian D. Ripley,                  ripley at stats.ox.ac.uk
>Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
>University of Oxford,             Tel:  +44 1865 272861 (self)
>1 South Parks Road,                     +44 1865 272866 (PA)
>Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>
>
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