Hello Matthew,

I do not have a direct answer to your problem, but you could try saving it
as an EPS and then rasterizing it using a graphics program (e.g., GIMP) to
whatever resolution you wanted.

Best luck finding a real solution.


Joshua



On Tue, Jan 26, 2010 at 9:05 AM, Matthew Walker
<matthew.walker.1@ulaval.ca>wrote:

> Hi,
>
> I expect that if I change only the resolution of an image, although the
> image would have more pixels, if viewed in the same physical size, the
> elements in the image would have the same physical size but with more
> detail.  However, when I use the "res" parameter of png() this is not what I
> see.  Would someone show me how I can just "increase the resolution" without
> changing the physical sizes of elements in my plot?
>
> Maybe an example would help?  Below are three images.  I expect that if I
> print them out, let's say scaled to fit the page, then items such as the
> words "Title Text" would appear the same size.  Instead (for the last two)
> it appears that the same number of pixels are being used, thus the text size
> appears smaller.
>
> What should I do to just increase the resolution?
>
> png("72dpi.png", width=6+2/3, height=6+2/3, units="in", res=72)
> plot(0,0, main="Title Text")
> dev.off()
>
> png("300dpi.png", width=6+2/3, height=6+2/3, units="in", res=300)
> plot(0,0, main="Title Text")
> dev.off()
>
> png("600dpi.png", width=6+2/3, height=6+2/3, units="in", res=600)
> plot(0,0, main="Title Text")
> dev.off()
>
> Thanks in advance,
>
> Matthew Walker
>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/

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