You forgot to mention your version of R and your platform (and R has at
least 3 separate png() devices).
In 2.7.0, specify the size in inches and increase the resolution.
In earlier versions, try bitmap(). From NEWS for 2.7.0
o Considerable efforts have been made to make the default output
from graphics devices as similar as possible (and in
particular close to that from postscript/pdf). Many devices
were misinterpreting 'pointsize' in some way, for example as
being in device units (pixels) rather than in points.
On Tue, 29 Apr 2008, Xavier Chardon wrote:
Hi all,
I prepared a few charts with ggplot2, and was happy with the results as
displayed on screen.
I tried to draw them with a PNG driver instead. But I ran into several
problems while trying to increase the resolution of the picture.
Mainly, when I increased the picture size (e.g png(width=1024, height=768) ),
the texts (title, labels, etc...) where too small. I tried to set the
"pointsize" option of the driver. That did the trick, to some extent. But it
seems limited, and I couldn't get big enough fonts for high resolution
images. Also, I tried the "resolution" setting of the driver. But this has an
effect on lots of things, e.g. the length of the lines in the legend, so I
gave up this idea.
I tried to change the font size of all elements, with e.g.
grid.gedit("label", gp=gpar(cex=4) ). But the position of the labels does not
change then, and with the bigger font, they are drawn on top of the axis or
of its title.
Another problem was that the line width is also too small in big images. I
couldn't find a way to change it globally.
So, is there a way to go easily from a plot that looks good on screen (X11
driver) to a similar png image? Or is it possible to change the default
settings of ggplot2 (line size and font size in particular, which are not
covered by the ggopt function) ? I guess people usually export their charts
as image files, so hopefully there's an easy solution.
Many thanks,
Xavier
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