Dear all,
I have invested substantial amount of work in a complicated, yet on
screen perfect looking graph that uses image(). Unfortunately saving it
as pdf (or quartz.save at high resolution) all generate very disturbing
border lines around each small rectangle that image() has drawn. While
using Preview it helps to turn off antialiasing to make those faint
lines disappear on screen
(http://cran.r-project.org/bin/macosx/RMacOSX-FAQ.html#Why-are-there-faint-lines-in-image-plots_003f).
However, they are far from faint on pdf (Adobe Reader v9.1.3, regardless
of settings) or any other high resolution rendering (printer) and do not
disappear, whatever I do. What I encounter is also in quite sharp
contrast with all I read on this issue, including R mailing lists (e.g.
http://finzi.psych.upenn.edu/R/Rhelp02/archive/30588.html), e.g. if
someone claims those lines would not matter and go away when printing.
In my case they don't.
BTW, my image() statement looks like this:
image(rfc, y, -t(zVals), zlim=c(-noCols-0.5,0.5), col =
heat.colors(noCols), axes=F, add=T)
where z is a 127 x 3 matrix.
Since I need high resolution variants for final publication I need to
know whether it is possible to force image() to give up drawing these
borders (I tried already several low level par parameters, all to no
avail). On screen everything looks perfect, pdf, clipboard, quartz.save,
save all look bad up to inacceptibly bad, especially pdf and any printing!
Reading all what I could find on this topic, I fear there might even a
bug be present in R (R 2.9.1 GUI 1.28 Tiger build 32-bit (5444)). Can
anyone offer some insight or even help?
Thanks.
Andreas
--
________________________________________________________________________
ETH Zurich
Prof. Dr. Andreas Fischlin
Systems Ecology - Institute of Integrative Biology
CHN E 21.1
Universitaetstrasse 16
8092 Zurich
SWITZERLAND
andreas.fisch...@env.ethz.ch
www.sysecol.ethz.ch/staff/af
+41 44 633-6090 phone
+41 44 633-1136 fax
Make it as simple as possible, but distrust it!
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