Perhaps yes. Sorry I did not check the bug reports. Can someone elaborate on the "undesirable artefacts"? I made two heatmaps using png() and CairoPNG(), respectively. I can see the difference, but it is not very clear to me what the artefacts are, or what the facts should be.
png(): http://i.imgur.com/lKrFG9i.png CairoPNG(): http://i.imgur.com/Dv0rsKK.png f = function(dev, ...) { dev(...) x = y <- seq(-4*pi, 4*pi, len = 27) r = sqrt(outer(x^2, y^2, "+")) z = cos(r^2)*exp(-r/6) image(z, main = deparse(substitute(dev))) dev.off() } f(grDevices::png, 'png-base.png', type = 'cairo') f(Cairo::CairoPNG, 'png-Cairo.png') Thanks! Regards, Yihui -- Yihui Xie <xieyi...@gmail.com> Web: http://yihui.name Department of Statistics, Iowa State University 2215 Snedecor Hall, Ames, IA On Mon, Oct 21, 2013 at 5:28 PM, Paul Murrell <p...@stat.auckland.ac.nz> wrote: > Hi > > Is this the same as "Bug 15462" ? > https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15462 > > Paul > > > On 10/22/13 10:43, Yihui Xie wrote: >> >> Hi, >> >> It seems that anti-aliasing in png(type = 'cairo') is not well >> supported for the point symbols without boarders, e.g. pch = 16. The >> Cairo package works well, though. You can compare png() with >> CairoPNG(): >> >> png(): http://i.imgur.com/8niB3jX.png >> CairoPNG(): http://i.imgur.com/FZBJOxm.png >> >> f = function(dev, ..., main = '') { >> dev(...) >> plot(c(1, 2, 1, 2), c(1, 1, 2, 2), pch=c(16, 19), cex=c(2, 2, 15, 15), >> xlim=c(0.5, 2.5), ylim=c(0.5, 3), main = deparse(substitute(dev))) >> dev.off() >> } >> f(grDevices::png, 'png-base.png', type = 'cairo') >> f(Cairo::CairoPNG, 'png-Cairo.png') >> >> If I remove the border for pch=19 (i.e. lwd=0), the point shows rough >> edges as well. >> >> I'm not sure if that is expected, or it is due to my misconfiguration >> somewhere. I installed R via `apt-get install r-base-dev` under Ubuntu >> using the CRAN repository. >> >>> sessionInfo() >> >> R version 3.0.2 (2013-09-25) >> Platform: x86_64-pc-linux-gnu (64-bit) >> >> locale: >> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C >> LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 >> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 >> LC_PAPER=en_US.UTF-8 LC_NAME=C >> [9] LC_ADDRESS=C LC_TELEPHONE=C >> LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C >> >> attached base packages: >> [1] stats graphics grDevices utils datasets methods base >> >> loaded via a namespace (and not attached): >> [1] Cairo_1.5-2 tools_3.0.2 >> >>> capabilities() >> >> jpeg png tiff tcltk X11 aqua http/ftp sockets >> TRUE TRUE TRUE TRUE TRUE FALSE TRUE TRUE >> libxml fifo cledit iconv NLS profmem cairo >> TRUE TRUE TRUE TRUE TRUE TRUE TRUE ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
