R help - Apr 2013 - Change the default resolution for plotting figures?

Hi,
I want to save a plot in the windows device as png and the default  
resolution is 72dpi. Is it possible to increase the default resolution  
to for example 300 dpi?
I have thought of using function png(..., res=300), but the problem is  
that the figure produced this way looks different than the one shown  
in the windows device. One notable difference is the missing of some  
ticks in the x axis. Therefore I would rather to produce the figure in  
a window device and then save it as a png. Unfortunately in the device  
window there is no such an option to change the resolution.
Little information can be found so far. Any ideas are appreciated!

Best,
Jing

I have been using the following so far without having any problems:

dev.copy(png,"sample.png",width=8, height=10,
units="in",res=500)
dev.off()




On Tue, Apr 16, 2013 at 6:32 PM, <jtang@mappi.helsinki.fi> wrote:
> Hi,
> I want to save a plot in the windows device as png and the default
> resolution is 72dpi. Is it possible to increase the default resolution to
> for example 300 dpi?
> I have thought of using function png(..., res=300), but the problem is
> that the figure produced this way looks different than the one shown in the
> windows device. One notable difference is the missing of some ticks in the
> x axis. Therefore I would rather to produce the figure in a window device
> and then save it as a png. Unfortunately in the device window there is no
> such an option to change the resolution.
> Little information can be found so far. Any ideas are appreciated!
>
> Best,
> Jing
>
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