[R] image() generates many border lines in pdf, not on screen (quartz) - R 2.9.1 GUI 1.28 Tiger build 32-bit (5444) - OS X 10.5.8
stefan.evert at uos.de
Mon Aug 24 13:42:44 CEST 2009
On 23 Aug 2009, at 20:26, Uwe Ligges wrote:
> Since it looks like nobody answered so far:
> Your code is not reproducible, we do not have rfc, y, zVals nor
It's much easier to reproduce: just type in the first example from the
"image" help page
x <- y <- seq(-4*pi, 4*pi, len=27)
r <- sqrt(outer(x^2, y^2, "+"))
image(z = z <- cos(r^2)*exp(-r/6), col=gray((0:32)/32))
then save from the quartz() display (I used the menu) and view with
Adobe Reader 9 (I seem to have 9.0.0). Instead of the fine white
lines you always get with Preview.app and other inaccurate PDF
renderers, there are now huge gaps between the pixels (around 1/10th
of pixel width).
This is very probably a bug in the Quartz device (or Quartz itself),
as the lines go away if you save the plot with dev.copy2pdf(), which I
@OP: Do you have any particular reason for using quartz.save() or the
menu item instead of dev.copy2pdf()?
> You could also try to place a screenshot somewhere on a webpage
> including the info about the settings of the corresponding viewer.
I've tried switching off _all_ of the numerous anti-aliasing options
of Adobe Reader 9; absolutely no difference.
Hope this helps,
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