Hi,
For those who are interested in the solution to this problem, I modified
the cairoDevice driver (version 2.10) so that it is now
resolution-aware. The owner of the package will probably include my
changes in his next release, but if in the meantime you would like to
use the modified version, please email me.
Cheers,
Matthew Walker
Joshua Wiley wrote:
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.walke...@ulaval.ca <mailto:matthew.walke...@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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Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/
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